In the great majority of animals there are traces of physical qualities and attitudes, which qualities are more markedly differentiated in the case of human beings. For just as we pointed out resemblances in the physical organs, so in a number of animals we observe gentleness and fierceness, mildness or cross temper, courage or timidity, fear or confidence, high spirits or low cunning, and, with regard to intelligence, something akin to sagacity.

—Aristotle, History of Animals

We want men, men, men.

—General Joseph Joffre to President Woodrow Wilson, April 1917