Put up in a place
where it's easy to see
the cryptic admonishment
T. T. T.
When you feel how depressingly
slowly you climb,
it's well to remember that
Things Take Time.
--Piet Hein
When I was eight or so I first picked up a copy of Piet Hein's book of poems. They came with his original doodles, and, having been brought up among academics, I thought 'He doodles just like a physicist!' Many years later I wiki'd him and found out that he was, indeed, a physicist.
If you think something's supposed to hurt, you're less likely to notice if you're doing it wrong. -- Paul Graham
It looks like, this month, I get to be the one to start the quotes thread.