This procedure [selecting the simplest law], however, has no logical justification but only a psychological one.

The logic of the world is prior to all truth and falsehood.

I am not interested in constructing a building, so much as in having a perspicuous view of the foundations of possible buildings.

What is troubling us is the tendency to believe that the mind is like a little man within.

The world is the totality of facts, not of things

A picture is a model of reality.

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?