An unrestricted satisfaction of every need presents itself as the most enticing method of conducting one's life, but it means putting enjoyment before caution, and soon brings its own punishment.

We are never so defensless against suffering as when we love.

Nature delights in making use of the same forms in the most various biological connections: as it does, for instance, in the appearance of branch-like structures both in coral and in plants, and indeed in some forms of crystal and in certain chemical precipitates.

Homosexuality is assuredly no advantage, but it is nothing to be ashamed of, no vice, no degradation, it cannot be classified as an illness.

All that matters is love and work.

In the depths of my heart I can’t help being convinced that my dear fellow-men, with a few exceptions, are worthless.

Children are completely egoistic; they feel their needs intensely and strive ruthlessly to satisfy them.