By endurance we conquer.

Optimism is true moral courage.

I chose life over death for myself and my friends... I believe it is in our nature to explore, to reach out into the unknown. The only true failure would be not to explore at all.

One feels 'the dearth of human words, the roughness of mortal speech' in trying to describe things intangible.

If I had not some strength of will I would make a first class drunkard.

If you're a leader, a fellow that other fellows look to, you've got to keep going.

Loneliness is the penalty of leadership, but the man who has to make the decisions is assisted greatly if he feels that there is no uncertainty in the minds of those who follow him, and that his orders will be carried out confidently and in the expectation of success.