Do not go gentle into that good night,
Old age should burn and rave at close of day;
Rage, rage against the dying of the light.
Though wise men at their end know dark is right,
Because their words had forked no lightning they

"Do not go gentle into that good night" - Dylan Thomas
https://www.poets.org/poetsorg/poem/do-not-go-gentle-good-night

First heard in the movie Interstellar, it's putting a nice explanation for their motivation. (Btw great movie, definitely worth seeing.)

In those words lies the rage against an upcoming death but it's bound to the metrum. It's fighting to break free from it, no matter what.
And that makes it perfect for the film and it shows that you should never give up trying and doing to reach your most wanted desire.