There is a truth in Schopenhauer’s view that philosophy is an organism, and that a book on philosophy, with a beginning and end, is a sort of contradiction. ... In philosophy matters are not simple enough for us to say ‘Let’s get a rough idea’, for we do not know the country except by knowing the connections between the roads.

We regard the photograph, the picture on our wall, as the object itself (the man, landscape, and so on) depicted there. This need not have been so. We could easily imagine people who did not have this relation to such pictures. Who, for example, would be repelled by photographs, because a face without color and even perhaps a face in reduced proportions struck them as inhuman.

Logic must look after itself. In a certain sense, we cannot make mistakes in logic.

I won't say 'See you tomorrow' because that would be like predicting the future, and I'm pretty sure I can't do that.

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

I don't know why we are here, but I'm pretty sure that it is not in order to enjoy ourselves.

If we were to imagine an orange on the blue side or green on the red side or violet on the yellow side, it would give us the same impression as a north wind coming from the southwest.