3.04 An a priori true thought would be one whose possibility guaranteed its truth.
3.05 We could only know a priori that a thought is true if its truth was to be recognized from the thought itself (without an object of comparison).
6.5 For an answer which cannot be expressed the question too cannot be expressed.
The riddle does not exist.
If a question can be put at all, then it can also be answered.
6.51 Scepticism is not irrefutable, but palpably senseless, if it would
doubt where a question cannot be asked.
For doubt can only exist where there is a question; a question
only where there is an answer, and this only where something
can be said.
6.53 The right method of philosophy would be this. To say nothing
except what can be said, i.e. the propositions of natural science,
i.e. something that has nothing to do with philosophy: and then
always, when someone else wished to say something metaphysical, to demonstrate to him that he had given no meaning to certain signs in his propositions. This method would be unsatisfying to the other;he would not have the feeling that we were teaching him philosophy;but it would be the only strictly correct method.
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