"And years later, spreading from an unknown source as most famous tales do, the story was told of a noble girl with a thirst for adventure who was stolen away by an assassin on the run..." (-Cat's Eye, C.M. Tryst)

Some say that all the worlds of the many-splendored universe lie nested one within the other like the layers of an onion. I say to you that they lie all braided and wound round and that no man nor woman either can map all the roads of their twisting. (-The Red Wyvern, Katharine Kerr)

Deliver us some evil
(Gotta love Chucky)

Time is the best teacher; unfortunately it kills all of its students

Honesty's the best policy but insanity is the best defense

Practice safe food. Use condiments.
(Oh, Sandra, I love it. Totally brilliant)

This, too, will pass.

If you can't remember it, then it wasn't that important in the first place.

Variety is not just the spice of life, it's the key to life.

And I'm not very religous, but I like this one:
"God is a DJ, life is a dance floor". (Pink, 'God is a DJ')