Probably the most famous quote featuring liberty is Patrick Henry's.
Generally speaking, Liberty is considered a personal goal, gift or right,
freedom seems to be more of a collective term.
Here's a few more quotes concerning Liberty.
The candle on the cake of Liberty comes from the Declaration of Independence,
"We hold these truths to be self-evident, that all men are created equal, that they are endowed by their Creator with certain unalienable Rights, that among these are Life, Liberty and the pursuit of Happiness."