“When you reach the stars, boy, yes, and live there forever, all the fears will go, and Death himself will die.”
Source: The Halloween Tree
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Ray Bradbury 401
American writer 1920–2012Related quotes

“Study as if you were going to live forever; live as if you were going to die tomorrow.”
The Book of Positive Quotations By John Cook, Leslie Ann Gibson (2nd ed. 2007), p. 283.
Attributed
Variant: Don't be afraid of death; be afraid of an unlived life. You don't have to live forever, you just have to live.
Source: Tuck Everlasting: Scholastic Book Guides
Fire from Heaven (1969)

Not by Twain, but from Edward Abbey's A Voice Crying In The Wilderness (1989).
Misattributed