Thomas Jefferson, 1743 - 1826
"Life is of no value but as it brings us gratifications. Among the most valuable of these is rational society. It informs the mind, sweetens the temper, cheers our spirits, and promotes health."
p. 79, Founding Rivals: Madison vs. Monroe
For context, this was taken from a letter penned to John Madison from Thomas Jefferson, in which Jefferson invited Madison to retire from public life and buy a small farm near his estate, where Madison would have free access to the Jefferson library and the two could enjoy one another's intellectual company.