Some quotes:

William Shakespeare - Julius Ceasar: 

"There is a tide in the affairs of men. Which, taken at the flood, leads on to fortune. But omitted, and the voyage of their life is bound in shallows and miseries. On such a full sea are we now afloat, and we must take the current when it serves - or lose the ventures before us." 

--

One Tree Hill - Episode 1x02:
"Do not let your fire go out, spark by irreplaceable spark in the hopeless swaps of the not quite, the not yet, and the not at all. Do not let the hero in your soul perish in lonely frustation on the life you deserved and have never been able to reach. The world you desire can be won. It exists. It is real. It is possible. It is yours."

--

George Bernard Shaw:

"Some men see things as they are and ask why. Others dream things that never were and ask why not." 

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Ralph Waldo Emerson:

"To laugh often and much; to win the respect of intelligent people and the affection of children; to earn the appreciation of honest critics and to endure the betrayal of false friends; to appreciate beauty; to find the best in others; to leave the world a bit better whether by a healthy child, a garden patch or a redeemed social condition; to know even one life has breathed easier because you have lived. This is to have succeeded." 

--

Oliver Wendell Holmes Jr.:

"I find the great thing in this world is not so much where we stand, as in what direction we are moving: To reach the port of heaven, we must sail sometimes with the wind and sometimes against it, but we must sail, and not drift, nor lie at anchor."