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.

Always get rid of theory private object in this way: assume that it constantly changes, but that you do not notice the change because your memory constantly deceives you.

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

That which cannot be said must not be said. That which cannot be said, one must be silent thereof.

When we can't think for ourselves, we can always quote

Philosophy, as we use the word, is a fight against the fascination which forms of expression exert upon us.

Philosophy hasn't made any progress? - If somebody scratches the spot where he has an itch, do we have to see some progress? Isn't genuine scratching otherwise, or genuine itching itching? And can't this reaction to an irritation continue in the same way for a long time before a cure for the itching is discovered?