Don't think, but look! (PI 66)

A propositional sign, applied and thought out, is a thought. A thought is a proposition with a sense.

What is troubling us is the tendency to believe that the mind is like a little man within.

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

How hard I find it to see what is right in front of my eyes!

Suppose someone were to say: 'Imagine this butterfly exactly as it is, but ugly instead of beautiful'?!

In order to be able to set a limit to thought, we should have to find both sides of the limit thinkable (i.e. we should have to be able to think what cannot be thought).