“The two most important phrases in the human language are "If only" and "Maybe someday". Our past mistakes and our unrequited longings. The things we regret and the things we yearn for. That's what makes us who we are.”

Napoleon : In His Own Words (1916)

Source: The Lover's Dictionary

CMU Graduation speech (2008)
Context: It is not the things we do in life that we regret on our death bed. It is the things we do not. I assure you I've done a lot of really stupid things, and none of them bother me. All the mistakes, and all the dopey things, and all the times I was embarrassed — they don't matter. What matters is that I can kind of look back and say: Pretty much any time I got chance to do something cool I tried to grab for it — and that's where my solace comes from.

Author's Remarks.
Under the Banner of Heaven: A Story of Violent Faith (2003)
Context: I don't know what God is, or what God had in mind when the universe was set in motion. In fact, I don't know if God even exists, although I confess that I sometimes find myself praying in times of great fear, or despair, or astonishment at a display of unexpected beauty. There are some ten thousand religious sects — each with its own cosmology, each with its own answer for the meaning of life and death. Most assert that the other 9,999 not only have it completely wrong but are instruments of evil, besides. None of the ten thousand has yet persuaded me to make the requisite leap of faith. In the absence of conviction, I've come to terms with the fact that uncertainty is an inescapable corollary of life. An abundance of mystery is simply part of the bargain — which doesn't strike me as something to lament. Accepting the essential inscrutability of existence, in any case, is surely preferable to its opposite: capitulating to the tyranny of intransigent belief. And if I remain in the dark about our purpose here, and the meaning of eternity, I have nevertheless arrived at an understanding of a few modest truths: Most of us fear death. Most of us yearn to comprehend how we got here, and why — which is to say, most of us ache to know the love of our creator. And we will no doubt feel that ache, most of us, for as long as we happen to be alive.

Source: Young Hearts Crying

Alleged to have been made in a September 13, 2001 press conference. This wording has not been confirmed.
Attributed, Misquotations

Source: Natural Right and History (1953), p. 36

In Zee News: I quit singles to prolong my career, says Sania http://zeenews.india.com/sports/tennis/i-quit-singles-to-prolong-my-career-says-sania_757389.html, 2 March 2013

Source: Life, the Truth, and Being Free (2010), p. 80