To have a right to do a thing is not at all the same as to be right in doing it.

Exactly at the instant when hope ceases to be reasonable it begins to be useful.

Women have a thirst for order and beauty as for something physical; there is a strange female power of hating ugliness and waste as good men can only hate sin and bad men virtue.

To mix science up with philosophy is only to produce a philosophy that has lost all its ideal value and a science that has lost all its practical value. It is for my private physician to tell me whether this or that food will kill me. It is for my private philosopher to tell me whether I ought to be killed.

I still think sincere pessimism the unpardonable sin.

Psychoanalysis is a science conducted by lunatics for lunatics. They are generally concerned with proving that people are irresponsible; and they certainly succeed in proving that some people are

But there is in everything a reasonable division of labour. I have written the book, and nothing on earth would induce me to read it.