Nothing is so difficult as not deceiving oneself.

Language is a part of our organism and no less complicated than it.

It is possible--indeed possible even according to the old conception of logic--to give in advance a description of all 'true' logical propositions. Hence there can never be surprises in logic.

The popular scientific books by our scientists aren't the outcome of hard work, but are written when they are resting on their laurels.

One often makes a remark and only later sees how true it is.

Philosophy is a battle against the bewitchment of our intelligence by means of language.

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