The child learns to believe a host of things. I.e. it learns to act according to these beliefs. Bit by bit there forms a system of what is believed, and in that system some things stand unshakeably fast and some are more or less liable to shift. What stands fast does so, not because it is intrinsically obvious or convincing; it is rather held fast by what lies around it.

It is possible--indeed possible even according to the old conception of logic--to give in advance a description of all 'true' logical propositions. Hence there can never be surprises in logic.

There are, indeed, things that cannot be put into words. They make themselves manifest. They are what is mystical.

Uttering a word is like striking a note on the keyboard of the imagination.

'Imagine a person whose memory could not retain what the word 'pain' meant-so that he constantly called different things by that name-but nevertheless used the word in a way fitting in with the usual symptoms and presuppositions of pain'-in short he uses it as we all do. Here I should like to say: a wheel that can be turned though nothing else moves with it, is not part of the mechanism.

A wheel that can be turned though nothing else moves with it, is not a part of the mechanism.

[M]an is fulfilling the purpose of existence who no longer needs to have any purpose except to live. That is to say, who is content.