The sense of the world must lie outside the world... What we cannot speak about we must remain silent about... What can be described can happen too, and what is excluded by the laws of causality cannot be described.

The world is made up of facts, not things.

Think of words as instruments characterized by their use, and then think of the use of a hammer, the use of a chisel, the use of a square, of a glue pot, and of the glue.

For a large class of cases - though not for all - in which we employ the word meaning it can be explained thus: the meaning of a word is its use in the language.

The common behavior of mankind is the system of reference by means of which we interpret an unknown language.

To think that you are not following a rule is to follow a rule.

Nothing is so difficult as not deceiving oneself.