206. If someone asked us 'but is that true?' we might say "yes" to him; and if he demanded grounds we might say "I can't give you any grounds, but if… - Ludwig Wittgenstein

The essential business of language is to assert or deny facts. Given the syntax of a language, the meaning of a sentence is determinate as soon as the meaning of the component words is known. In order that a certain sentence should assert a certain fact there must, however the language may be constructed, be something in common between the structure of the sentence and the structure of the fact.

What is the proof that I know something? Most certainly not my saying I know it.

How do I know that someone is enchanted? How does one learn the linguistic expression of enchantment? What does it connect up with? With the expression of bodily sensations? Do we ask someone what he feels in his breast and facial muscles in order to find out whether he is feeling enjoyment? But does that mean that there aren't any sensations after all which often return when one is enjoying music? Certainly not. (In some places he is near weeping, and he feels it in his throat.) A poem makes an impression on us as we read it.