"... We all must run, whether old or young, whether sick or healthy. And this is possible for the sick and senile because the race is run with the heart, not the legs, and the fight is fought with the heart, not the fists. It is a race and a fight not against other athletes, but against unbelief...

It is not a fight to keep all the powers of youth, but to trust in the power of God. The race is run against temptations that would make us doubt God's goodness.

... The fight is a fight to keep hoping in God... It is a race against hopelessness, not flawlessness."

(John Piper, "Taste and See")