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.

What signs fail to express, their application shows. What signs slur over, their application says clearly.

Every sign by itself seems dead. What gives it life?--In use it is alive. Is life breathed into it there?--Or is the use its life?

Death is not an event in life: we do not live to experience death.

Here the term 'language-game' is meant to bring into prominence the fact that the speaking of language is part of an activity, of a form of life.

What Copernicus really achieved was not the discovery of a true theory but of a fertile new point of view.

I act with complete certainty. But this certainty is my own.