Only the real, rare, true scientific minds can endure doubt, which is attached to all our knowledge.

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.

No one who has seen a baby sinking back satiated from the breast and falling asleep with flushed cheeks and a blissful smile can escape the reflection that this picture persists as a prototype of the expression of sexual satisfaction in later life.

Against the suffering which may come upon one from human relationships the readiest safeguard is voluntary isolation, keeping oneself aloof from other people. The happiness which can be achieved along this path is, as we see, the happiness of quietness. Against the dreaded external world one can only defend oneself by some kind of turning away from it, if one intends to solve the task by oneself.

Flowers are restful to look at. They have neither emotions nor conflicts.

What is common in all these dreams is obvious. They completely satisfy wishes excited during the day which remain unrealized. They are simply and undisguisedly realizations of wishes.

Just as no one can be forced into belief, so no one can be forced into unbelief.