Uttering a word is like striking a note on the keyboard of the imagination.

Is it even always an advantage to replace an indistinct picture by a sharp one? Isn't the indistinct one often what we need?

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

It is a dogma of the Roman Church that the existence of God can be proved by natural reason. Now this dogma would make it impossible for me to be a Roman Catholic. If I thought of God as another being like myself, outside myself, only infinitely more powerful, then I would regard it as my duty to defy him.

The popular scientific books by our scientists aren't the outcome of hard work, but are written when they are resting on their laurels.

Telling someone something he does not understand is pointless, even if you add that he will not be able to understand it.

To convince someone of the truth, it is not enough to state it, but rather one must find the path from error to truth.