The human species, according to the best theory I can form of it, is composed of two distinct races, the men who borrow and the men who lend.
Charles Lamb

The Indian Corn, or Maiz, proves the most useful Grain in the World; and had it not been for the Fruitfulness of this Species, it would have proved very difficult to have settled some of the Plantations in America.
John Lawson

The major novelty of my theory was its claim that the most rapid evolutionary change does not occur in widespread, populous species, as claimed by Most geneticists, but in small founder populations.
Ernst Mayr

The mode of consciousness of nonhuman species is quite different from human consciousness.
J. M. Coetzee

The more you know about a species, the more you understand about how better to help protect them.
Alan Clark

The one process now going on that will take millions of years to correct is the loss of genetic and species diversity by the destruction of natural habitats. This is the folly our descendants are least likely to forgive us.
E. O. Wilson

The only way to save a rhinoceros is to save the environment in which it lives, because there's a mutual dependency between it and millions of other species of both animals and plants.
David Attenborough

The question that will decide our destiny is not whether we shall expand into space. It is: shall we be one species or a million? A million species will not exhaust the ecological niches that are awaiting the arrival of intelligence.
Freeman Dyson

The real threat to whales is whaling, which has endangered many whale species.
Dave Barry

The relation of the individual person to the species he belongs to is the most intimate of all relations.
Havelock Ellis

The reproduction of mankind is a great marvel and mystery. Had God consulted me in the matter, I should have advised him to continue the generation of the species by fashioning them out of clay.
Martin Luther

The sexes in each species of being... are always true equivalents - equals but not identical.
Antoinette Brown Blackwell

The struggle for existence holds as much in the intellectual as in the physical world. A theory is a species of thinking, and its right to exist is coextensive with its power of resisting extinction by its rivals.
Thomas Huxley

The student who deceives himself into thinking that he is giving his life like an ascetic in the spirit of sacrifice for art, is the victim of a deplorable species of egotism.
Alma Gluck

The thought that we're in competition with Russians or with Chinese is all a mistake, and trivial. We are one species, with a world to win.
George Wald

The truth is that from birth on we are, to one extent or another, a fairly sensual species.
Jock Sturges

There are certain books in the world which every searcher for truth must know: the Bible, the Critique of Pure Reason, the Origin of Species, and Karl Marx's Capital.
Al Capp

There are minds so impatient of inferiority that their gratitude is a species of revenge, and they return benefits, not because recompense is a pleasure, but because obligation is a pain.
Samuel Johnson

There are three species of government: republican, monarchical, and despotic.
Charles de Secondat

There exists a species of transcendental ventriloquism by means of which men can be made to believe that something said on earth comes from Heaven.
Georg C. Lichtenberg