“It cannot be true, therefore, that among animals some of the offspring will possess the desirable qualities of the parents in greater degree, or that animals are indefinitely perfectible.”
Source: An Essay on The Principle of Population (First Edition 1798, unrevised), Chapter IX, paragraph 9, lines 1-3
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Thomas Robert Malthus 60
British political economist 1766–1834Related quotes

Organic and Inorganic
Source: The Note-Books of Samuel Butler (1912), Part VI - Mind and Matter

"Secrets Known Only to the Inner Elites", in his political journal The Campaigner (May-June 1978), p. 64.

Last Diaries (1979) edited by Leon Stilman, p. 77
Context: How good is it to remember one's insignificance: that of a man among billions of men, of an animal amid billions of animals; and one's abode, the earth, a little grain of sand in comparison with Sirius and others, and one's life span in comparison with billions on billions of ages. There is only one significance, you are a worker. The assignment is inscribed in your reason and heart and expressed clearly and comprehensibly by the best among the beings similar to you. The reward for doing the assignment is immediately within you. But what the significance of the assignment is or of its completion, that you are not given to know, nor do you need to know it. It is good enough as it is. What else could you desire?

The Tragic Sense of Life (1913), VIII : From God to God
Context: In the vast all of the Universe, must there be this unique anomaly — a consciousness that knows itself, loves itself and feels itself, joined to an organism which can only live within such and such degrees of heat, a merely transitory phenomenon? No, it is not mere curiosity that inspires the wish to know whether or not the stars are inhabited by living organisms, by consciousness akin to our own, and a profound longing enters into that dream that our souls shall pass from star to star through the vast spaces of the heavens, in an infinite series of transmigrations. The feeling of the divine makes us wish and believe that everything is animated, that consciousness, in a greater or less degree, extends through everything. We wish not only to save ourselves, but to save the world from nothingness. And therefore God. Such is his finality as we feel it.

Orot Yisrael, Ch. 5, article 10, p. 156; as quoted in "The Distinction between Jews and Gentiles in Torah" by Rabbi David Bar Chaim http://www.daatemet.org.il/articles/article.cfm?article_id=119&lang=en
Variant:
The dissimilarity between the Jewish soul, in all its independence, inner desires, longings, character and standing vis-à-vis the soul of all the Gentiles — on all of their levels — is greater and deeper than the difference between the soul of a man and the soul of an animal, for the difference in the latter case is one of quantity, while the difference in the first case is one of essential quality
As quoted in "A British Synagogue Bans a Famous Hassidic Text!" (February 2010) by Rabbi Michael Leo Samuel http://rabbimichaelsamuel.com/2010/02/2744/#_ftn1.
Orot

Small Houses: Their Economic Design and Construction (1922)