Without meaning, without substance, without aim: a mere 'public opinion'.

Partial knowledge is more triumphant than complete knowledge; it takes things to be simpler than they are, and so makes its theory more popular and convincing.

Improvements are invented only by those who can feel that something is not good.

Whoever thinks much and to good purpose easily forgets his own experiences, but not the thoughts which these experiences have called forth.

I awoke you from your sleep because I saw that you were having a nightmare. And now you are cross and say to me: "What are we supposed to do now? Everything is still night!" You ingrates! You should go to sleep again and dream better.

What is it that endowed things with meaning, value, significance? The creating heart, which desired, and, out of its desire, created. It created joy and woe. It wanted to satiate itself with woe. We must take all the suffering that has been endured by men and animals upon ourselves and affirm it, and possess a goal in which it acquires reason.

And many such good inventions are there, that they are like woman's breasts: useful at the same time, and pleasant.