I cannot get from the nature of the proposition to the individual logical operations!!! That is, I cannot bring out how far the proposition is the pi… - Ludwig Wittgenstein

The world of the happy man is a different one from that of the unhappy man.

We say of a proof that it convinces us of a logical law. — But of course a proof starts somewhere. And the point is: What convinces us of the primitive propositions on which the proof is based? Here there is no proof.

How far my efforts agree with those of other philosophers I will not decide. Indeed what I have here written makes no claim to novelty in points of detail; and therefore I give no sources, because it is indifferent to me whether what I have thought has already been thought before me by another.