My favs.

Software Engineering Proverbs

It is not enough to do your best: you must know what to do, and THEN do your best.

-- W. Edwards Deming

A leader is best when people barely know that he exists.
Less good when they obey and acclaim him.
Worse when they fear and despise him.
Fail to honor people, and they fail to honor you.
But of a good leader, when his work is done, his aim fulfilled,
they will say, "We did this ourselves."

-- Lao-Tzu

You must be the change
You wish to see in the world

-- Gandhi

One test is worth a thousand opinions.

If something is worth doing once, it's worth building a tool to do it.