A man is ethical only when life, as such, is sacred to him, that of plants and animals as that of his fellow men, and when he devotes himself helpfully to all life that is in need of help.

Does my behavior in respect of love affect nothing? That is because there is not enough love in me.

Thought is the strongest thing we have. Work done by true and profound thought - that is a real force.

All the kindness which a man puts out into the world works on the heart and thoughts of mankind.

We cannot abdicate our conscience to an organization, nor to a government.

In case my life should end with the cannibals, I hope they will write on my tombstone, 'We have eaten Dr. Schweitzer. He was good to the end.'

It seemed incredible to me, that physical courage should be so commonplace and revered, while moral courage . . . is so rare and despised.