Don't be afraid to give up the good to go for the great

I'd  also come to recognize that the simplicity of running was quite liberating.  Modern man has virtually everything one could desire, but too often we're still not fulfilled.  "Things" don't bring happiness.  Some of my finest moments came while running down the open road, little more than a pair of shoes and shorts to my name.  A runner doesn't need much.  Thoreau once said that a man's riches are based on what he can do without.  Perhaps in needing less, you're actually getting more.
-Dean Karnazes

Pain is the body's way off ridding itself of weakness.

Let us run with Perseverance the race marked out for us
-Hebrews 12:1

joy always came after pain

Come to the edge, he said. 

They said: We are afraid. 
Come to the edge, he said. 
They came. 
He pushed them and they flew.

To give anything less than your best is to sacrifice the gift

It's rude to count people as you pass them. Out loud