We are asleep. Our Life is a dream. But we wake up sometimes, just enough to know that we are dreaming.

It is obvious that an imagined #‎ world , however different it may be from the real one, must have something - a form - in common with it.

If we spoke a different language, we would perceive a somewhat different world.

It is an hypothesis that the sun will rise tomorrow: and this means that we do not know whether it will rise.

If we were to imagine an orange on the blue side or green on the red side or violet on the yellow side, it would give us the same impression as a north wind coming from the southwest.

A French politician once wrote that it was a peculiarity of the French language that in it words occur in the order in which one thinks them.

Mathematics is a logical method. . . . Mathematical propositions express no thoughts. In life it is never a mathematical proposition which we need, but we use mathematical propositions only in order to infer from propositions which do not belong to mathematics to others which equally do not belong to mathematics.