"The highest expression of strength is tenderness toward the vulnerable. For where clarity resides, peace inevitably follows."

"They must often change, who would be constant in happiness or wisdom."

"He who reads widely and ponders deeply builds an unshakeable inner citadel. Reflect upon this whenever doubt clouds your horizon."

"If we don't know life, how can we know death?"

"My message, especially to young people is to have courage to think differently, courage to invent, to travel the unexplored path, courage to discover the impossible and to conquer the problems and succeed. These are great qualities that they must work towards. This is my message to the young people."

"Success is always something completely different to people. I feel like I've succeeded, if I'm doing something that makes me happy and I'm not lying to anybody. I'm not doing that now, so I feel really good about myself."

"Of course, there is no question that Libya - and the world - will be better off with Gaddafi out of power. I, along with many other world leaders, have embraced that goal, and will actively pursue it through non-military means. But broadening our military mission to include regime change would be a mistake."

"The seeds of triumph are sown in the quiet mornings when no one is watching."