Will Rogers . It takes lots of things to prove you are smart, but only one thing to prove you are ignorant. There is no genius free from some tincture of madness. Sanity calms, but madness is more interesting. I'll be the in to your sane.
Common sense is genius dressed in working clothes.
Ralph Waldo Emerson . 1803-1882 Knowledge comes, but wisdom lingers. Whoever loves instruction loves knowledge, but he who hates correction is stupid. Anyone who isn't confused really doesn't understand the situation. Only two things are infinite, the Universe and human stupidity, and I'm not sure of the former.