Here are a few I really like.
"We're all in this together -- by ourselves." and
"It's gonna get worse before it gets worse."
(both by comedian/actor Lily Tomlin)
"Inside every older person is a younger person wondering: what the f**k happened!"
(comedian Jennifer Unlimited)
"The person who says it cannot be done should not interrupt the person doing it."
(Chinese proverb)
"Question: How many surrealists does it take to wish you a Happy Birthday?"
"Answer: Fish."
(on a greeting card by 78th Street)
And, finally, from that famous quoter Anonymous:
"Work as if you don't need the money, love as if you've never been hurt and dance as if nobody's watching."