Science never cheered up anyone. The truth about the human situation is just too awful.

No, today is the day we honor, of course, the Presidents, ranging from George Washington, who couldn't tell a lie, to George Bush, who couldn't tell the truth, to Bill Clinton, who couldn't tell the difference. Monologue, 19 February 2007 (U.S. Presidents Day)

Truth, not a pet, is man's best friend.

Nothing in this world is harder than speaking the truth, nothing easier than flattery.

There is one great truth on this planet: whoever you are, or whatever it is that you do, when you really want something, it's because that desire originated in the soul of the universe.... The soul of the world is nourished by people's happiness.