Some quotes:
"A conservative is a man who sits and thinks. Mostly sits." Woodrow Wilson
"What is conservatism? Is it not adherence to the old and tried, against the new and untried?" Abraham Lincoln
"The conservative is a tame man." Henry David Thoreau
A liberal says, "No man is an island; no man stands alone." A conservative says, "What I do is none of your business."
A definition I once heard involved a tree with a rotten limb. The conservative wants to wait and see if the tree will heal itself. The liberal wants to saw off the limb. The radical wants to chop down the tree and plant a new one.
"A conservative is a man who is too cowardly to fight, and too fat to run." Elbert Hubbard
"Both conservatives and liberals have their own pet spending areas. Conservatives want much smaller government in the areas liberals favor, but vastly larger government in their own pet areas. Liberals would just as soon have smaller government in the areas conservatives favor, but vastly larger government in their own pet areas."