"Do not trust any algebraic geometer who cannot draw", Anon.

"It is wrong to think that the task of physics is to find out how Nature is. Physics concerns what can be said about Nature", N. Bohr.

"What we observe is not Nature herself, but Nature exposed to our methods of questioning her!", W. Heisenberg.

"Whereof one cannot speak, thereof one must be silent", Wittgenstein.