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

It is one of the chief skills of the philosopher not to occupy himself with questions which do not concern him.

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.

Propositions show what they say: tautologies and contradictions show that they say nothing.

The fact that we can describe the motions of the world using Newtonian mechanics tell us nothing about the world. The fact that we do, does tell us something about the world.

Never stay up on the barren heights of cleverness, but come down into the green valleys of silliness.

At the core of all well-founded belief lies belief that is unfounded.