Inner Freedom: A Spiritual Journey for Prison Inmates (2008)
“Don't worry about the people in your past. There's a reason they didn't make it to your future.”
Related quotes

“Three reasons why young people don't have to worry about their future: education, politics and me.”
Source: Presidential Election Campaign 2012

The Camelot Project interview (1996)
Context: When the legend is retold, it mirrors the reality of the time, and one can learn from studying how various authors have attempted to retell the story. I don't think we have an obligation to change it radically. I think that if we ever move too far from the basic story, we would lose something very precious. I don't, for instance, approve of fantasy that attempts to go back and rewrite the Middle Ages until it conforms to political correctness in the twentieth century. That removes all the benefit from reading the story. If you don't understand other people in their time and why they did what they did, then you don't understand your own past. And when you lose your past, you lose some potential for your own future.

“Create your future from your future, not your past.”
The Success Principles: How to Get from Where You Are to Where You Want to Be

“When your house is burning down, you don't worry about the remodeling.”
The Daily Show with Jon Stewart, unspecified episode

“You can't change the past, but you can ruin the present by worrying about the future.”
To mothers, who were worried about the fate of their children. Quoted in "Gestapo: Instrument of Tyranny" - Page 118 - by Edward Crankshaw - History - 1956

Source: interview https://www.rollingstone.com/politics/politics-features/katie-hill-california-democrat-738027/ with Rolling Stone (2018)