Give the world the best you have and you'll get kicked in the teeth.
Give the world the best you have anyway.

Source: From the poem The Paradoxical Commandments written by Kent M Keith while he was a undergraduate at Harvard.

Comment: In 1997, Keith learned that the poem "The Paradoxical Commandments" had hung on the wall of Mother Teresa's children's home in Calcutta, India and, two decades after writing the original poem, Dr. Keith wrote a book of the same title expanding on the themes of the poem: Anyway: The Paradoxical Commandments: Finding Personal Meaning in a Crazy World.

Sourced here with appreciation from Wikipedia