A teacher who can show good, or indeed astounding results while he is teaching, is still not on that account a good teacher, for it may be that, while his pupils are under his immediate influence, he raises them to a level which is not natural to them, without developing their own capacities for work at this level, so that they immediately decline again once the teacher leaves the schoolroom.
The object of philosophy is the logical clarification of thoughts. Philosophy is not a theory but an activity.
Die Welt des Glücklichen ist eine andere als die des Unglücklichen