The more we get out of the world, the less we leave, and in the long run we shall have to pay our debts at a time that may be very inconvenient for our own survival.
Source: The Human Use of Human Beings.
-- Norbert Wiener, (Nov 26 1894-1964), US mathematician; He established the science of cybernetics, common factors of control and communication in living organisms, automatic machines, and organizations.