No man can see over his own height. Let me explain what I mean. You cannot see in another man any more than you have in yourself. Your own level strictly determines the extent to which he comes within your understanding. If your intelligence is unawakened, mental qualities in another, even though they be of the highest kind, will have no effect on you at all… his higher mental qualities will no more exist for you than colors exist for those who cannot see.

Arthur Schopenhauer (1788 – 1860)