The first and greatest victory is to conquer yourself; to be conquered by yourself is of all things most shameful and vile.
Sun Tzu - Chinese general, military strategist, writer and philosopher
Victorious warriors win first and then go to war, while defeated warriors go to war first and then seek to win.
Sharon Lee - American science fiction, fantasy and mystery author
The moment you say 'I know everything' is the end of your growth.
William B. Irvine - Professor of philosophy at Wright State University
Pay attention to your enemies, for they are the first to discover your mistakes.
Russell Simmons - American entrepreneur, record executive, writer, and film producer
A person's strength is to know their weaknesses.
Josh Waitzkin - American chess player, martial arts competitor, and author. As a child, he was recognized as a prodigy, and won the U.S. Junior Chess championship in 1993 and 1994. The film Searching for Bobby Fischer is based on his early life
One of the most critical strengths of a superior competitor in any discipline—whether we are speaking about sports, business negotiations, or even presidential debates—is the ability to dictate the tone of the battle.