“There can be little doubt that the greater size and strength of man, in comparison with woman, together with his broader shoulders, more developed muscles, rugged outline of body, his greater courage and pugnacity, are all due in chief part to inheritance from his half-human male ancestors. These characters would, however, have been preserved or even augmented during the long ages of man's savagery, by the success of the strongest and boldest men, both in the general struggle for life and in their contests for wives; a success which would have ensured their leaving a more numerous progeny than their less favoured brethren.”

1900s, The Moral Equivalent of War (1906)
Context: In modern eyes, precious though wars may be they must not be waged solely for the sake of the ideal harvest. Only when forced upon one, is a war now thought permissible.
It was not thus in ancient times. The earlier men were hunting men, and to hunt a neighboring tribe, kill the males, loot the village and possess the females, was the most profitable, as well as the most exciting, way of living. Thus were the more martial tribes selected, and in chiefs and peoples a pure pugnacity and love of glory came to mingle with the more fundamental appetite for plunder.
Modern war is so expensive that we feel trade to be a better avenue to plunder; but modern man inherits all the innate pugnacity and all the love of glory of his ancestors. Showing war's irrationality and horror is of no effect on him. The horrors make the fascination. War is the strong life; it is life in extremis; war taxes are the only ones men never hesitate to pay, as the budgets of all nations show us.

Source: Words of Radiance

As A Man Thinketh (1902), Serenity

Federalist No. 10
1780s, Federalist Papers (1787–1788)

Toils And Pleasures.
The Silverado Squatters (1883)

second edition (1874), chapter XIX: "Secondary Sexual Characters of Man", page 564 http://darwin-online.org.uk/content/frameset?pageseq=587&itemID=F944&viewtype=image
The Descent of Man (1871)

As A Man Thinketh (1902), Serenity
Context: The calm man, having learned how to govern himself, knows how to adapt himself to others; and they, in turn, reverence his spiritual strength, and feel that they can learn of him and rely upon him. The more tranquil a man becomes, the greater is his success, his influence, his power for good.

The Dreamstone, Book One : The Gruagach, Ch. 1 : Of Fish and Fire
Arafel's Saga (1983)
Context: Things there are in the world which have never loved Men, which have been in the world far longer than humankind, so that once when Men were newer on the earth and the woods were greater, there had been places a Man might walk where he might feel the age of the world on his shoulders. Forests grew in which the stillness was so great he could hear stirrings of a life no part of his own. There were brooks from which the magic had not gone, mountains which sang with voices, and sometimes a wind touched the back of his neck and lifted the hairs with the shiver of a presence at which a Man must never turn and stare.
But the noise of Men grew more and more insistent. Their trespasses became more bold. Death had come with them, and the knowledge of good and evil, and this was a power they had, both to be virtuous and to be blind.

Life Without Principle (1863)
Context: I wish to suggest that a man may be very industrious, and yet not spend his time well. There is no more fatal blunderer than he who consumes the greater part of his life getting his living. All great enterprises are self-supporting. The poet, for instance, must sustain his body by his poetry, as a steam planing-mill feeds its boilers with the shavings it makes. You must get your living by loving.