Only two things are infinite, the universe and human stupidity, and I'm not sure about the former.
(Albert Einstein)

The most incomprehensible thing about the world is that it is at all comprehensible.
(Albert Einstein)

Whoever undertakes to set himself up as a judge of Truth and Knowledge is shipwrecked by the laughter of the gods.
(Albert Einstein)

The two most abundant things in the universe are Hydrogren and stupidity.
(Harlan Ellison)

I hate quotations. Tell me what you know.
(Ralph Waldo Emerson)

Question everything. Learn something. Answer nothing.
(Engineer's Motto)

We never know the worth of water 'til the well is dry.
(English Proverb)

Ignorance of one's misfortunes is clear gain.
(Euripides)

You couldn't get a clue during the clue mating season in a field full of horny clues if you smeared your body with clue musk and did the clue mating dance.
(Edward Flaherty)

The intelligent man finds almost everything ridiculous, the sensible man hardly anything.
(Johann Wolfgang von Goethe)