It is one of the chief skills of the philosopher not to occupy himself with questions which do not concern him.

Philosophy is not a theory but an activity.

A picture whose pictorial form is logical form is called a logical picture.

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.

When you are philosophizing you have to descend into primeval chaos and feel at home there.

A philosopher always finds more grass to feed upon in the valleys of stupidity than on the arid heights of intelligence.

It seems to me that, in every culture, I come across a chapter headed 'Wisdom.' And then I know exactly what is going to follow: 'Vanity of vanities, all is vanity.'