Tractatus Logico-Philosophicus (with linked TOC)

What can be said at all can be said clearly; and whereof one cannot speak thereof one must be silent.

whenever a question can be decided by logic at all it must be possible to decide it without more ado.

Indeed a composite soul would no longer be a soul.

5.5421 This shows too that there is no such thing as the soul—the subject, etc.—as it is conceived in the superficial psychology of the present day.

5.542 It is clear, however, that ‘A believes that p’, ‘A has the thought p’, and ‘A says p’ are of the form ‘”p” says p’: and this does not involve a correlation of a fact with an object, but rather the correlation of facts by means of the correlation of their objects.

5.473 Logic must look after itself.

5.4611 Signs for logical operations are punctuation-marks,

There are no numbers.

nothing correct can be said in philosophy. Every philosophical proposition is bad grammar, and the best that we can hope to achieve by philosophical discussion is to lead people to see that philosophical discussion is a mistake.

Mr Wittgenstein begins his theory of Symbolism with the statement (2.1): “We make to ourselves pictures of facts.” A picture, he says, is a model of the reality, and to the objects in the reality correspond the elements of the picture: the picture itself is a fact.