Old men are fond of giving good advice to console themselves for their inability to give bad examples. – Francois de La Rochefoucauld

Prejudices are so to speak the mechanical instincts of men: through their prejudices they do without any effort many things they would find too difficult to think through to the point of resolving to do them. – Georg C. Lichtenberg

The problems of the world cannot possibly be solved by skeptics or cynics whose horizons are limited by the obvious realities. We need men who can dream of things that never were. – John F. Kennedy