There is no more light in a genius than in any other honest man—but he has a particular kind of lens to concentrate this light into a burning point. - Ludwig Wittgenstein

Scepticism is not irrefutable, but obviously nonsensical, when it tries to raise doubts where no questions can be asked. For doubt can exist only where a question exists, a question only where an answer exists, and an answer only where something can be said. (6.51)

The problems are solved, not by giving new information, but by arranging what we have known since long.

Language disguises the thought; so that from the external form of the clothes one cannot infer the form of the thought they clothe, because the external form of the clothes is constructed with quite another object than to let the form of the body be recognized.