To think that you are not following a rule is to follow a rule.

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.

Nothing is more important for teaching us to understand the concepts we have than to construct fictitious ones.

All propositions are of equal value.

Whereof one cannot speak, thereof one must be silent.

The truth of the thoughts that are here set forth seems to me unassailable and definitive. I therefore believe myself to have found, on all essential points, the final solution of the problems. And if I am not mistaken in this belief, then the second thing in which the value of this work consists is that it shows how little is achieved when these problems are solved.

The process of induction is the process of assuming the simplest law that can be made to harmonize with our experience.