A philosopher is a man who has to cure many intellectual diseases in himself before he can arrive at the notions of common sense. - Ludwig Wittgenstein

A tautology's truth is certain, a proposition's possible, a contradiction's impossible. (Certain, possible, impossible: here we have the first indication of the scale that we need in the theory of probability.) (4.464)

I am showing my pupils details of an immense landscape which they cannot possibly know their way around.

A main source of our failure to understand is that we don’t have an overview of the use of our words. – Our grammar is deficient in surveyability. A surveyable representation produces precisely that kind of understanding which consists in ‘seeing connections’. …
The concept of a surveyable representation is of fundamental significance for us. It characterizes the way we represent things, how we look at matters. (Is this a ‘Weltanschauung’?)