My principal sin is doubt. I doubt everything, and am in doubt most of the time.

Perhaps it is even more important to know what one should not think about than what one should think about.

The true meaning of Christ's teaching consists in the recognition of love as the supreme law of life, and therefore not admitting any exceptions.

When ignorance does not know something, it says that what it does not know is stupid.

All, everything that I understand, I understand only because I love.

Everything comes in time to him who knows how to wait.

The feeling of patriotism - It is an immoral feeling because, instead of confessing himself a son of God . . . or even a free man guided by his own reason, each man under the influence of patriotism confesses himself the son of his fatherland and the slave of his government, and commits actions contrary to his reason and conscience.