Language is a part of our organism and no less complicated than it.

The philosophical I is not the human being, not the human body or the human soul with the psychological properties, but the metaphysical subject, the boundary (not a part) of the world.

Don't for heaven's sake, be afraid of talking nonsense! But you must pay attention to your nonsense.

Elementary propositions consist of names.

In order to draw a limit to thinking, we should have to think both sides of this limit.

Philosophy aims at the logical clarification of thoughts. Philosophy is not a body of doctrine but an activity. A philosophical work consists essentially of elucidations.

Philosophy is not a body of doctrine but an activity. ...Without philosophy thoughts are, as it were, cloudy and indistinct: its task is to make them clear and to give them sharp boundaries.