No Man is an island, entire of itself. Every man is a piece of the continent, a part of the main. If a clod be washed away by the sea, Europe is the less, as well as if a promontory were, as well as if a manor of thy friends or of thine own were. Any man's death diminishes me, because I am involved in mankind; and, therefore, never send to know for whom the bell tolls - it tolls for thee.
-- John Donne 1572-1631
It is one of the most beautiful compensations in life that no man can sincerely try to help another without helping himself.
-- Ralph Waldo Emerson
If a man be gracious and courteous to strangers, it shows he is a citizen of the world, and that his heart is no island cut off from other lands, but a continent that joins to them.
-- Francis Bacon 1561-1626
No man is born unto himself alone; Who lives unto himself, he lives to none.
-- Francis Quarles 1592-1644