Knowing all truth is less than doing a little bit of good.

It doesn't matter if an animal can reason. It matters only that it is capable of suffering and that is why I consider it my neighbor.

Reverence for Life affords me my fundamental principle of morality, namely, that good consists in maintaining, assisting, and enhancing life and that to destroy, harm, or to hinder life is evil. Affirmation of the world - that is affirmation of the will to live, which appears in phenomenal forms all around me - is only possible for me in that I give myself out for other life.

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

To affirm life is to deepen, to make more inward, and to exalt the will-to-life. At the same time the man who has become a thinking being feels a compulsion to give every will-to-live the same reverence for life that he gives to his own. He experiences that other life as his own. He accepts as being good: to preserve life, to raise to its highest value life which is capable of development; and as being evil: to destroy life, to injure life, to repress life which is capable of development. This is the absolute, fundamental principle of the moral, and it is a necessity of thought.

A good example has twice the value of good advice

Humanitarianism consists in never sacrificing a human being to a purpose.