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.

For a large class of cases - though not for all - in which we employ the word meaning it can be explained thus: the meaning of a word is its use in the language.

There are, indeed, things that cannot be put into words. They make themselves manifest. They are what is mystical.

Suppose someone follows the series "1,3,5,7, ..", and in writing the series 2x+1; and he asked himself "But am I always doing the same thing, or something different every time?" If from one day to the next someone promises: "Tomorrow I will give up smoking", does he say the same thing every day, or every day something different?

I Once wrote: "In mathematics process and result are equivalent."

The world is independent of my will.

I give no sources, because it is indifferent to me whether what I have thought has already been thought before me by another.