Daybreak http://books.google.com/books?id=Imte1JcsQ64C&q=%22You+don't+get+to+choose+how+you're+going+to+die+Or+when+You+can+only+decide+how+you're+going+to+live+Now%22&pg=PA135#v=onepage (1968)
Variant or paraphrase: You can't decide how you're going to die. Or when. What you can decide is how you're going to live now.
“Choosing to be positive and having a grateful attitude is going to determine how you're going to live your life.”
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Joel Osteen 65
American televangelist and author 1963Related quotes
“Your mindset determines your destiny, so choose positivity and watch your life transform.”
Source: https://www.goodreads.com/quotes/11654652-your-mindset-determines-your-destiny-so-choose-positivity-and-watch
Source: Striking Thoughts (2000), p. 120
from "The cradle snatchers", article by Frank Worrall, Melody Maker (3 September 1983)
In interviews etc., About life and death
Source: Plenty: A Collection of Sarah McLachlan's Favorite Recipes
Variant: Your talent determines what you can do. Your motivation determines how much you are willing to do. Your attitude determines how well you do it.