You run and you run to catch up to the sun, but it's sinking, circles around and comes up behind you again. The sun is the same in a relative way but you're older, shorter of breath and one day closer to death.
Sorry I was listening to Pink Floyd today. Some very poetic and profound lyrics are to be found there.
"Never was anything great achieved without danger." Niccolò Machiavelli
"Whosoever desires constant success must change his conduct with the times." Niccolò Machiavelli
Tho' much is taken, much abides; and though
We are not now that strength which in old days
Moved earth and heaven; that which we are, we are;
One equal temper of heroic hearts,
Made weak by time and fate, but strong in will
To strive, to seek, to find, and not to yield.
---Tennyson