When I'm in a bad mood:
"You're doomed. You and all the shy people are. Natural selection favours the loud and the aggressive. I don't mean this in a bad way, but genetically, you are a cul-de-sac." - Bernard Black (Black Books)
"It was like being in an Edgar Allen Poe story. You’re just not that person everybody thinks you are, although they call you that all the time." - Bob Dylan
"Lazy she lies alone in clover and sweet-grass, seventeen and never been sweet in the grass, ho ho" - Dylan Thomas
"I wasted time, and now doth time waste me." - William Shakespeare
When I actually want to cheer myself up and get motivated:
"The best remedy for those who are afraid, lonely or unhappy is to go outside, somewhere where they can be quiet, alone with the heavens, nature and God. Because only then does one feel that all is as it should be and that God wishes to see people happy, amidst the simple beauty of nature. As long as this exists, and it certainly always will, I know that then there will always be comfort for every sorrow, whatever the circumstances may be. And I firmly believe that nature brings solace in all troubles." - Anne Frank
"You can make more friends in two months by becoming really interested in other people, than you can in two years by trying to get other people interested in you." - Bernard Meltzer
And just random:
"I love quotations because it is a joy to find thoughts one might have, beautifully expressed with much authority by someone recognised wiser than oneself." - Marlene Dietrich
"Sometimes it’s easier to be polite than it is to be rude....sometimes the other way round." - Bob Dylan
"Laziness may look appealing, but only work brings real satisfaction." - Anne Frank
"Elephants are contagious" - Paul Eluard