...perhaps the hopes I have confessed to are of an illusory nature, too. But I hold fast to one distinction. Apart from the fact that no penalty is imposed for not sharing them, my illusions are not, like religious ones, incapable of correction.

Love and work, work and love...that's all there is.

Illusions commend themselves to us because they save us pain and allow us to enjoy pleasure instead. We must therefore accept it without complaint when they sometimes collide with a bit of reality against which they are dashed to pieces.

From error to error one discovers the entire truth.

Knowledge is the intellectual manipulation of carefully verified observations.

Religion [is] the universal obsessional neurosis of humanity

I should like to raise the question whether the inevitable stunting of the sense of smell as a result of man's turning away from the earth, and the organic repression of the smell-pleasure produced by it, does not largely share in his predisposition to nervous diseases.