The sense of paralysis proceeds not so much out of the mammoth size of the problem but out of the puniness of the purpose.

If something comes to life in others because of you, then you have made an approach to immortality.

Just as there is no loss of basic energy in the universe, so no thought or action is without its effects, present or ultimate, seen or unseen, felt or unfelt.

The essence of man is imperfection.

He who keeps his cool best wins.

The capacity for hope is the most significant fact of life. It provides human beings with a sense of destination and the energy to get started.

Pessimism is a waste of time.