“Stop hoping, start believing.”
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Nick Jonas 3
American singer 1992
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Source: Reported in Jay Babcock, " MUSIC IS NEVER WRONG: A visit with Josh Homme & John Paul Jones of Them Crooked Vultures http://www.arthurmag.com/2009/10/15/them-crooked-vultures/", Arthur Magazine (October 15, 2009).
Context: But yeah, as we all look at the same projection on the wall, we do become one, and I started to realize the horror of that. And I make no attempt to try to alter it from being that; my thing is more about trying to apply some principles of magic—how to walk between the raindrops—and take advantage of a situation like that, because it’s the only choice you have.

“When you stopped believing in God, did you stop believing in good and evil?”
"No. But I stopped believing there was a power of good and a power of evil that were outside us. And I came to believe that good and evil are names for what people do, not for what they are. All we can say is that this is a good deed, because it helps someone, or that's an evil one, because it hurts them. People are too complicated to have simple labels."
Will and Mary in Ch. 33 : Marzipan
His Dark Materials, The Amber Spyglass (2000)

“First stop lying, then start speaking the truth.”
Other

“Stop consuming images and start producing them. ”

I feel the same about Unix.
"Ken Thompson clarifies matters", 1999

“stop fixing your bodies and start fixing the world!”