“If a single cell, under appropriate conditions, becomes a man in the space of a few years, there can surely be no difficulty in understanding how, under appropriate conditions, a cell may, in the course of untold millions of years, give origin to the human race.”

— Herbert Spencer

Vol. I, Part III: The Evolution of Life, Ch. 3 : General Aspects of the Evolution Hypothesis; compare: "As nine months go to the shaping an infant ripe for his birth, / So many a million of ages have gone to the making of man", Alfred Lord Tennyson, Maud (1855)
Principles of Biology (1864)

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Herbert Spencer81

English philosopher, biologist, sociologist, and prominent … 1820–1903

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“Surely if a single cell may, when subjected to certain influences, become a man in the space of twenty years; there is nothing absurd in the hypothesis that under certain other influences, a cell may, in the course of millions of years, give origin to the human race.”

Herbert Spencer (1820–1903) English philosopher, biologist, sociologist, and prominent classical liberal political theorist

The Development Hypothesis (1852)

“The human family now exists under conditions of a global village. We live in a single constricted space resonant with tribal drums.”

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“The study of the conditions for change begins appropriately with an analysis of the conditions for “no change,” that is, for the state of equilibrium.”

Kurt Lewin (1890–1947) German-American psychologist

Source: 1940s, Quasi-Stationary Social Equilibria and the Problem of Permanent Change, 1947, p. 40.

“Wherever the want of clothing forced them to it, the human race made clothes for thousands of years, without a single man becoming a tailor.”

Karl Marx (1818–1883) German philosopher, economist, sociologist, journalist and revolutionary socialist

Vol. I, Ch. 1, Section 2, pg. 49.
(Buch I) (1867)

“The circumstances of justice may be described as the normal conditions under which human cooperation is both possible and necessary.”

John Rawls book A Theory of Justice

Source: A Theory of Justice (1971; 1975; 1999), Chapter III, Section 22, pg. 126

“Changing animals by putting human genes or cells into their structure is one way of making them more resemble the bit of the human condition you're interested in studying.”

Martin Bobrow (1938) geneticist

Source: As quoted in Medical research warning over human cells in animals https://www.theguardian.com/science/2011/jul/22/medical-research-humans-animals-regulation by Alok Jha, 22 July 2011, The Guardian.

“We can assume that in a relatively short time — perhaps within 100 million years — the one celled organism evolved into a colony of cells. With the further passage of time, groups of cells within those colonies assumed specialized functions of food-gathering, digestion, the structural features of an outer skin, and so on; thus began the stage of evolution leading to the complex, many-celled creatures which dominate life today.
The fossil record contains no trace of these preliminary stages in the development of many-celled organisms. The first clues to the existence of relatively advanced forms of life consist of a few barely discernible tracks, presumably made in the primeval slime by soft, wriggling wormlike animals. These are found in rocks about one billion years old. These meager remains are the earliest traces of many-celled animal life on the planet.”

Robert Jastrow (1925–2008) American astronomer

Red Giants and White Dwarfs : Man's Descent from the Stars (1971), p. 249.

“The strengthening of behavior which results from reinforcement is appropriately called "conditioning."”

B.F. Skinner (1904–1990) American behaviorist

In operant conditioning we "strengthen" an operant in the sense of making a response more probable or, in actual fact, more frequent.
Science and Human Behavior (1953)

“You have an excellent heart, my friend — but your grey cells are in a deplorable condition.”

Agatha Christie (1890–1976) English mystery and detective writer

Hercule Poirot’s Early Cases (1974)

“All contradictory things are interconnected; not only do they coexist in a single entity in given conditions, but in other given conditions, they also transform themselves into each other. This is the full meaning of the identity of opposites. This is what Lenin meant when he discussed "how they happen to be (how they become) identical--under what conditions they are identical, transforming themselves into one another."”

Mao Zedong book On Contradiction

Selected Readings from the Works of Mao Tse-Tung, pp. 121
On Contradiction (1937)
Original: (zh-CN) 一切矛盾着的东西，互相联系着，不但在一定条件之下共处于一个统一体中，而且在一定条件之下互相转化，这就是矛盾的同一性的全部意义。列宁所谓“怎样成为同一的（怎样变成同一的），——在怎样的条件之下它们互相转化，成为同一的”，就是这个意思。

“If a single cell, under appropriate conditions, becomes a man in the space of a few years, there can surely be no difficulty in understanding how, under appropriate conditions, a cell may, in the course of untold millions of years, give origin to the human race.”

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