"Trust in what you love, continue to do it, and it will take you where you need to go." (written on a paper weight on my desk)
"Chance is always powerful. Let your hook be always cast; in the pool where you least expect it, there will be a fish." Ovid
"Every blade of grass has its Angel that bends over it and whispers, 'Grow, grow.'" The Talmud
The last quote is my favorite. It's such a lovely visual.