It is those who concentrates on but one thing at a time who advance in this world. The great man or woman is the one who never steps outside his or her specialty or foolishly dissipates his or her individuality.
Og MandinoI will remove from my vocabulary such words and phrases as quit, cannot, unable, impossible, out of the question, improbable, failure, unworkable, hopeless, and retreat; for they are the words of fools.
Og Mandino