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“Biological evolution is a system of constant divergence without subsequent joining of branches. Lineages, once distinct, are separate forever. In human history, transmission across lineages is, perhaps, the major source of cultural change. Europeans learned about corn and potatoes from Native Americans and gave them smallpox in return.”

Stephen Jay Gould

"The Panda's Thumb of Technology", p. 65
Bully for Brontosaurus (1991)

History , Learning , Change

“My visceral perception of brotherhood harmonizes with our best modern biological knowledge. […] Many people think (or fear) that equality of human races represents a hope of liberal sentimentality probably squashed by the hard realities of history. They are wrong. This essay can be summarized in a single phrase, a motto if you will: Human equality is a contingent fact of history. Equality is not true by definition; it is neither an ethical principle (though equal treatment may be) nor a statement about norms of social action. It just worked out that way. A hundred different and plausible scenarios for human history would have yielded other results (and moral dilemmas of enormous magnitude). They didn't happen.”

Stephen Jay Gould book The Flamingo's Smile

"Human Equality Is a Contingent Fact of History", p. 186
The Flamingo's Smile (1985)

People , Fear , Hope , Way

“[W]hat intellectual phenomenon can be older, or more oft repeated, than the story of a large research program that impaled itself upon a false central assumption accepted by all practitioners? Do we regard all people who worked within such traditions as dishonorable fools? What of the scientists who assumed that the continents were stable, that the hereditary material was protein, or that all other galaxies lay within the Milky Way? These false and abandoned efforts were pursued with passion by brilliant and honorable scientists. How many current efforts, now commanding millions of research dollars and the full attention of many of our best scientists, will later be exposed as full failures based on false premises?”

Stephen Jay Gould book Eight Little Piggies

"Fall in the House of Ussher", p. 187
Eight Little Piggies (1993)

People , Fools , Way , Failure

“The contingency of history (both for life in general and for the cultures of Homo sapiens) and human free will (in the factual rather than theological sense) are conjoined concepts, and no better evidence can be produced than the “experimental” production of markedly different solutions in identical environments.”

Stephen Jay Gould book Eight Little Piggies

"Unenchanted Evening", p. 29
Eight Little Piggies (1993)

Life , History , Sense

“Eternal vigilance, as they say, is the price of freedom. Add intellectual integrity to the cost basis.”

Stephen Jay Gould book Leonardo's Mountain of Clams and the Diet of Worms

"The Tallest Tale", p. 315
Leonardo's Mountain of Clams and the Diet of Worms (1998)

Freedom

“Yet I also appreciate that we cannot win this battle to save species and environments without forging an emotional bond between ourselves and nature as well—for we will not fight to save what we do not love (but only appreciate in some abstract sense). So let them all continue—the films, the books, the television programs, the zoos, the little half acre of ecological preserve in any community, the primary school lessons, the museum demonstrations, even […] the 6:00 A. M. bird walks. Let them continue and expand because we must have visceral contact in order to love. We really must make room for nature in our hearts.”

Stephen Jay Gould book Eight Little Piggies

"Unenchanted Evening", p. 40
Eight Little Piggies (1993)

Love , Books , School , Communication

“If we choose a weak and foolish speculation as a primary textbook illustration (falsely assuming that the tale possesses a weight of history and a sanction of evidence), then we are in for trouble - as critics properly nail the particular weakness, and then assume that the whole theory must be in danger if supporters choose such a fatuous case as a primary illustration.”

Stephen Jay Gould book Leonardo's Mountain of Clams and the Diet of Worms

"The Tallest Tale", p. 314
Leonardo's Mountain of Clams and the Diet of Worms (1998)

History , Support , Falseness

“Very little comes easily to our poor, benighted species (the first creature, after all, to experiment with the novel evolutionary inventions of self-conscious philosophy and art). Even the most “obvious,” “accurate,” and “natural” style of thinking or drawing must be regulated by history and won by struggle. Solutions must therefore arise within a social context and record the complex interactions of mind and environment that define the possibility of human improvement.”

Stephen Jay Gould book Leonardo's Mountain of Clams and the Diet of Worms

"Seeing Eye to Eye, Through a Glass Clearly", p. 72
Leonardo's Mountain of Clams and the Diet of Worms (1998)

Art , History , Nature , Thinking

“Arthropods and vertebrates share some broad features of general organization - elongated, bilaterally symmetrical bodies, with sensory organs up front, excretory structures in the back, and some form of segmentation along the major axis. But the geometry of major internal organs could hardly be more different… Arthropods concentrate their nervous system on their ventral (belly) side as two major cords running along the bottom surface of the animal. The mouth also opens on the ventral side, with the esophagus passing between the two nerve cords, and the stomach and remainder of the digestive tube running along the body above the nerve cords. In vertebrates, and with maximal contrast, the central nervous system runs along the dorsal (top) surface as a single tube culminating in a bulbous brain at the front end. The entire digestive system then runs along the body axis below the nerve cord.”

Stephen Jay Gould book Leonardo's Mountain of Clams and the Diet of Worms

"Brotherhood by Inversion", p. 321
Leonardo's Mountain of Clams and the Diet of Worms (1998)

Animals

“So why fret and care that the actual version of the destined deed was done by an upper class English gentleman who had circumnavigated the globe as a vigorous youth, lost his dearest daughter and his waning faith at the same time, wrote the greatest treatise ever composed on the taxonomy of barnacles, and eventually grew a white beard, lived as a country squire just south of London, and never again traveled far enough even to cross the English Channel? We care for the same reason that we love okapis, delight in the fossil evidence of trilobites, and mourn the passage of the dodo. We care because the broad events that had to happen, happened to happen in a certain particular way. And something unspeakably holy—I don't know how else to say this—underlies our discovery and confirmation of the actual details that made our world and also, in realms of contingency, assured the minutiae of its construction in the manner we know, and not in any one of a trillion other ways, nearly all of which would not have included the evolution of a scribe to record the beauty, the cruelty, the fascination, and the mystery.”

Stephen Jay Gould book The Structure of Evolutionary Theory

Source: The Structure of Evolutionary Theory (2002), p. 1342

Love , Youth , World , Faith

“The theory of punctuated equilibrium, proposed by Niles Eldredge and myself, is not, as so often misunderstood, a radical claim for truly sudden change, but a recognition that ordinary processes of speciation, properly conceived as glacially slow by the standard of our own life-span, do not resolve into geological time as long sequences of insensibly graded intermediates (the traditional, or gradualistic, view), but as geologically “sudden” origins at single bedding planes.”

Stephen Jay Gould book Time's Arrow, Time's Cycle

Source: Time's Arrow, Time's Cycle (1987), pp. 2–3

Life , Change , Time

“I am not insensible to natural beauty, but my emotional joys center on the improbable yet sometimes wondrous works of that tiny and accidental evolutionary twig called Homo sapiens. And I find, among these works, nothing more noble than the history of our struggle to understand nature—a majestic entity of such vast spatial and temporal scope that she cannot care much for a little mammalian afterthought with a curious evolutionary invention, even if that invention has, for the first time in some four billion years of life on earth, produced recursion as a creature reflects back upon its own production and evolution. Thus, I love nature primarily for the puzzles and intellectual delights that she offers to the first organ capable of such curious contemplation.”

Stephen Jay Gould

Prologue, p. 13
Bully for Brontosaurus (1991)

Love , Life , Beauty , History

“I have long recognized the theory and aesthetic of such comprehensive display: show everything and incite wonder by sheer variety. But I had never realized how powerfully the decor of a cabinet museum can promote this goal until I saw the Dublin [Natural History Museum] fixtures redone right. […] The exuberance is all of one piece—organic and architectural. I write this essay to offer my warmest congratulations to the Dublin Museum for choosing preservation—a decision not only scientifically right, but also ethically sound and decidedly courageous. The avant-garde is not an exclusive locus of courage; a principled stand within a reconstituted rear unit may call down just as much ridicule and demand equal fortitude. Crowds do not always rush off in admirable or defendable directions.”

Stephen Jay Gould book Dinosaur in a Haystack

"Cabinet Museums: Alive, Alive, O!", p. 244
Dinosaur in a Haystack (1995)

History , Courage , Nature , Decision

“I… praise the newly opened halls of fossil mammals at the American Museum of Natural History. …teaching us about evolutionary trees by organizing the entire hall as a central trunk and set of branches… placing our brains in our feet and letting us learn by walking. …the chosen geometry of evolutionary organization… violates the traditional picture of life's history, thus illustrating… an important principle in the history of science: the central role of pictures, graphs, and other forms of visual representation in channeling and constraining our thought. …Words are an evolutionary afterthought. …My colleagues have actually done it. …They have ordered all the fossils into an unconventional iconographic tree that fractures the bias of progress. …so that we can preambulate along the tree of life and absorb the new scheme viscerally by walking… They have taken Colbert's radical idea and arranged all the fossils by their branching order, not their later "success" or "advancement."”

Stephen Jay Gould book Dinosaur in a Haystack

Groups that branch early appear early in the hall... Sea cows and elephants are at the end of the hall, horses in the middle, and primates near the beginning.
"Evolution by Walking", pp. 249-254.
Dinosaur in a Haystack (1995)

Life , History , Idea , Tree

“[T]rying to keep an intellectual away from literature works about as well as recommending chastity to Homo sapiens, the sexiest primate of all.”

Stephen Jay Gould

The Median Isn't the Message (1985)

Literature

“A complete theory of evolution must acknowledge a balance between “external” forces of environment imposing selection for local adaptation and “internal” forces representing constraints of inheritance and development. Vavilov placed too much emphasis on internal constraints and downgraded the power of selection. But Western Darwinians have erred equally in practically ignoring (while acknowledging in theory) the limits placed on selection by structure and development—what Vavilov and the older biologists would have called “laws of form.””

Stephen Jay Gould book Hen's Teeth and Horse's Toes

"A Hearing for Vavilov", p. 144
Hen's Teeth and Horse's Toes (1983)

Law

“I want to argue that the “sudden” appearance of species in the fossil record and our failure to note subsequent evolutionary change within them is the proper prediction of evolutionary theory as we understand it. […] Evolutionary “sequences” are not rungs on a ladder, but our retrospective reconstruction of a circuitous path running like a labyrinth, branch to branch, from the base of the bush to a lineage now surviving at its top.”

Stephen Jay Gould book Ever Since Darwin

"Bushes and Ladders in Human Evolution", p. 61
Ever Since Darwin (1977)

Failure , Understanding , Appearance , Change

“Our failure to discern a universal good does not record any lack of insight or ingenuity, but merely demonstrates that nature contains no moral messages framed in human terms. Morality is a subject for philosophers, theologians, students of the humanities, indeed for all thinking people. The answers will not be read passively from nature; they do not, and cannot, arise from the data of science. The factual state of the world does not teach us how we, with our powers for good and evil, should alter or preserve it in the most ethical manner.”

Stephen Jay Gould book Hen's Teeth and Horse's Toes

"Nonmoral Nature", pp. 42–43
Hen's Teeth and Horse's Toes (1983)

People , World , Failure , Nature

“No one should feel at all offended or threatened by the obvious fact that we are not all born entirely blank, or entirely the same, in our mixture of the broad behavioral propensities defining what we call “temperament.””

Stephen Jay Gould book The Lying Stones of Marrakech

"The Internal Brand of the Scarlet W", p. 281
The Lying Stones of Marrakech (2001)

Behavior , Feeling

“In what other world is myth so harmless? Great battles kill and maim; great homers and no-hitters are pure joy or deep tragedy without practical consequence […]. Life is inherently ambiguous; baseball games pit pure good against abject evil. Even Saddam Hussein must have committed one act of kindness in his life, but what iota of good could possibly be said for aluminum bats or the designated hitter rule?”

Stephen Jay Gould

"Baseball and the Two Faces of Janus", p. 272; originally published as "The Virtues of Nakedness" in The New York Review of Books (1990-10-11)
Triumph and Tragedy in Mudville (2003)

Life , World , Game , Evil