It is a good thing for an educated man to read books of quotations.
 -- Winston Churchill

There's a difference between philosophy and a bumper sticker.
 -- Charles Schulz

Bartlett's Quotations
bartleby.com quotations
brainyquote.com
Phrase Finder
quotegarden.com
memorablequotations.com
allaboutquotes.com
directory.google.com/.../Quotations

Philosophers' quotes

Sociology quotes

Quotes about quotes

Kung Fu (television series) quotes
kungfu-guide.com -- (quotes in each season's episode pages)
dm.net/~karen/kungfu/kungfu_epguide.html
epguides.com/KungFu/