“I remember a Stephen Harper once upon a time… You've become what you used to oppose… Mr. Harper, what happened to you? What changed?”
To Mr. Harper, contending the Prime Minister used advocate cleaning up government and caring for the environment; 2011 English Language Federal Election Debate http://www.theglobeandmail.com/news/politics/obituary-jack-layton-in-quotes/article2135661/?from=sec368
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Jack Layton 22
Leader of the New Democratic Party of Canada 1950–2011Related quotes

On the general election of 1979, quoted in Kenneth Morgan, Callaghan: A Life (1997), p. 697
Prime Minister

“What matters in life is not what happens to you but what you remember and how you remember it.”
Living to Tell the Tale (2002)
Variant: Life is not what one lived, but what one remembers and how one remembers it in order to recount it.

The Golden Legend http://www.gutenberg.org/files/10490/10490-h/10490-h.htm, Pt. IV, The Cloisters (1872).
“It's not what you've got, it's what you use that makes a difference.”

“And something is happening here, but you don't know what it is, do you Mr. Jones?”
Song lyrics, Highway 61 Revisited (1965), Ballad of a Thin Man
"Forgiveness" (7 July 2007)
Context: Now do we have to forgive and forget? No! In fact sometimes it's important to remember, so that you can prevent something like that from happening again, or know that it's not ok with you, even with that person or anyone else.
But forgiving — why not? Do it so that you can be free. And I guarantee you, you will be free of this thing. And even if you don't tell this person you've forgiven them, because sometimes you can't, it's amazing what will happen in your life, what will happen with that person, what will happen with you and other people, if you have a forgiving spirit and let it go.