Albert Einstein quote: “It is humankind's duty to respect all life, not only animals have feelings but even also trees and plants.”

“There is, nevertheless, a certain respect and a general duty of humanity that ties us, not only to beasts that have life and sense, but even to trees and plants.”

Michel De Montaigne book Essays

Book II, Ch. 11. Of Cruelty
Essais (1595), Bartlett's Familiar Quotations, 10th ed. (1919)

“We are sinful not only because we have eaten of the Tree of Knowledge, but also because we have not yet eaten of the Tree of Life.”

Franz Kafka book The Zürau Aphorisms

83, a slight variant of this was later published in Parables and Paradoxes (1946):
We are sinful not merely because we have eaten of the Tree of Knowledge, but also because we have not yet eaten of the Tree of Life. The state in which we find ourselves is sinful, quite independent of guilt.
Also quoted in this form in The Parables of Peanuts (1968) by Robert L. Short, and Like a Dream, Like a Fantasy: The Zen Teachings and Translations of Nyogen (2005)
The Zürau Aphorisms (1917 - 1918)
Context: We are sinful not only because we have eaten of the Tree of Knowledge, but also because we have not yet eaten of the Tree of Life. The state in which we are is sinful, irrespective of guilt.

“Hindus have a saying that even a castor plant can pass as a tree in a land devoid of real trees. Jesus can pass as God only among people who have never known what constitutes Godhood.”

Sita Ram Goel (1921–2003) Indian activist

Source: History of Hindu-Christian Encounters (1996)

“Our planet, the Earth, is, as far as we know, unique in the universe. It contains life. Even in its most barren stretches, there are animals. Around the equator, where those two essentials for life, sunshine and moisture, are most abundant, great forests grow. And here plants and animals proliferate in such numbers that we still have not even named all the different species. Here, animals and plants, insects and birds, mammals and man live together in intimate and complex communities, each dependent on one another. Two thirds of the surface of this unique planet are covered by water, and it was here indeed that life began. From the oceans, it has spread even to the summits of the highest mountains as animals and plants have responded to the changing face of the Earth.”

David Attenborough (1926) British broadcaster and naturalist

Opening narration
The Living Planet (1984)

““In the end Humankind destroyed the heaven and the earth,” Soapstone began…
“And Humankind said, ‘Let there be security,’ and there was security. And Humankind tested the security, that it would detonate. And Humankind divided the U-235 from the U-238. And the evening and the morning were the first strike.” Soapstone looked up from the book. “Some commentators feel that the author should have inserted, ‘And Humankind saw the security, that it was evil.’ Others point out that such a view was not universally shared.”…
Casting his eyes heavenward, Soapstone continued. “And Humankind said, ‘Let there be a holocaust in the midst of the dry land.’ And Humankind poisoned the aquifers that were below the dry land and scorched the ozone that was above the dry land. And the evening and the morning were the second strike.”…
“And Humankind said, ‘Let the ultraviolet light destroy the food chains that bring forth the moving creature!’ And the evening and the morning—”…
“And Humankind said, ‘Let there be rays in the firmament to fall upon the survivors!’ And Humankind made two great rays, the greater gamma radiation to give penetrating whole-body doses, and the lesser beta radiation to burn the plants and the bowels of animals! And Humankind sterilized each living creature, saying, ‘Be fruitless, and barren, and cease to—’””

James K. Morrow (1947) (1947-) science fiction author

Source: This Is the Way the World Ends (1986), Chapter 9, “In Which by Taking a Step Backward the City of New York Brings Our Hero a Step Forward” (pp. 115-116; ellipses not in the original)

“What, then, is the animal? First of all, a system of plant-souls. The unity of those plant-souls, which unity nature itself produces, is the soul of the animal. Its world is therefore partly that of the plants — its nourishment, for instance, it receives partly through synthesis from vegetable, and through analysis from animal nature — and partly that of the animals, whereof we shall speak directly. Each product of nature is an organically in-itself completed totality in space, like the plant. Hence, the unknown x which we are looking for must also be such a whole or totality, and in so far it must also have a principle of organization, a sphere and central point of this organization; in short, the same which we have called the soul of the plant, which thus remains common to both. … The animal is a system of plant-souls, and the plant is a separated, isolated part of an animal. Both reciprocally affect each other.”

Johann Gottlieb Fichte (1762–1814) German philosopher

Source: The Science of Rights 1796, P. 502, 503, 504

“Humankind differs from the animals only by a little and most people throw that away.”

Confucius (-551–-479 BC) Chinese teacher, editor, politician, and philosopher

“I believe that animals have descended from at most only four or five progenitors, and plants from an equal or lesser number.

Analogy would lead me one step further, namely, to the belief that all animals and plants have descended from some one prototype. But analogy may be a deceitful guide. Nevertheless all living things have much in common, in their chemical composition, their germinal vesicles, their cellular structure, and their laws of growth and reproduction. We see this even in so trifling a circumstance as that the same poison often similarly affects plants and animals; or that the poison secreted by the gall-fly produces monstrous growths on the wild rose or oak-tree. Therefore I should infer from analogy that probably all the organic beings which have ever lived on this earth have descended from some one primordial form, into which life was first breathed by the Creator.”

Charles Darwin book On the Origin of Species (1859)

Source: On the Origin of Species (1859), chapter XIV: "Recapitulation and Conclusion", page 484 http://darwin-online.org.uk/content/frameset?pageseq=505&itemID=F376&viewtype=side, in the second (1860) edition

“As to our garden and yard, we have all the woods. And the wilderness is our only cloister, for our house is like an oak tree planted therein.”

Théodore Guérin (1798–1856) Catholic saint and nun from France

First Journal of Travel (1840)

“The power which causes the several portions of the plant to help each other, we call life. Much more is this so in an animal. We may take away the branch of a tree without much harm to it; but not the animal's limb. Thus, intensity of life is also intensity of helpfulness — completeness of depending of each part on all the rest. The ceasing of this help is what we call corruption; and in proportion to the perfectness of the help, is the dreadfulness of the loss. The more intense the life has been, the more terrible is its corruption.”

John Ruskin book Modern Painters

Volume V, part VIII, chapter 1, section 4 (1860).
Modern Painters (1843-1860)

“It is humankind's duty to respect all life, not only animals have feelings but even also trees and plants.”

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