A main cause of philosophical disease-an unbalanced diet: one nourishes one's thinking with only one kind of example.

A man's thinking goes on within his consciousness in a seclusion in comparison with which any physical seclusion is an exhibition to public view.

How small a thought it takes to fill a life.

Someone who knows too much finds it hard not to lie.

A philosophical problem has the form: I don't know my way about.

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

That which cannot be said must not be said. That which cannot be said, one must be silent thereof.