"Don't ever count yourself out. You'll never know how good you are unless you try. Dream the impossible and go out and make it happen. I walked on the moon. What can't you do?"

Eugene Cernan (1934-2017) in documentary The Last Man on the Moon (2014).
apollo 17, launch, and nasa image apollo 17 and astronaut image
Space flights: Apollo 17, Apollo 10, Gemini 9A