A philosopher who is not taking part in discussions is like a boxer who never goes into the ring.

Don't get involved in partial problems, but always take flight to where there is a free view over the whole single great problem, even if this view is still not a clear one.

A philosophical problem has the form: I don't know my way about.

The agreement or disagreement or its sense with reality constitutes its truth or falsity.

For an answer which cannot be expressed the question too cannotbe expressed. The riddle does not exist. If a question can beput at all, then it can also be answered.

Don't think, but look! (PI 66)