“What is good? All that heightens the feeling of power in man, the will to power, power itself. What is bad? All that is born of weakness. What is happiness? The feeling that power is growing, that resistance is overcome.”

Introduction, Z. Hanfi, trans., in The Fiery Brook (1972), p. 102
The Essence of Christianity (1841)

Source: The Spanish Drama (1846), Ch. 2
Context: A man may be buoyed up by the efflation of his wild desires to brave any imaginable peril; but he cannot calmly see one he loves braving the same peril; simply because he cannot feel within turn that which prompts another. He sees the danger, and feels not the power that is to overcome it.

The Quran calls on the weak and oppressed to gain strength http://english.bayynat.org/TheHolyQuran/Quran_QuranCalls.htm

Source: Between Man and Man (1965), p. 152

1990s, Moab is My Washpot (autobiography, 1997)

Addendum to the account of 8 October 1918.
Diary of Alvin York
Context: After the Armistice was signed, I was ordered to go back to the scene of my fight with the machine guns. General Lindsey and some other generals went with me.
We went over the ground carefully. The officers spent a right smart amount of time examining the hill and the trenches where the machine guns were, and measuring and discussing everything.
And then General Lindsey asked me to describe the fight to him. And I did. And then he asked me to march him out just like I marched the German major out, over the same ground and back to the American lines.
Our general was very popular. He was a natural born fighter and he could swear just as awful as he could fight. He could swear most awful bad.
And when I marched him back to our old lines he said to me, "York, how did you do it?" And I answered him, "Sir, it is not man power. A higher power than man power guided and watched over me and told me what to do." And the general bowed his head and put his hand on my shoulder and solemnly said, "York, you are right."
There can be no doubt in the world of the fact of the divine power being in that. No other power under heaven could bring a man out of a place like that. Men were killed on both sides of me; and I was the biggest and the most exposed of all. Over thirty machine guns were maintaining rapid fire at me, point-blank from a range of about twenty-five yards.

Introduction, p. 3
Capitalism and Freedom (1962)

Power of the Gospel.
Song lyrics, Fight for Your Mind (1995)