forget what's behind, strain ahead

Philippians 3:12-14 has been encouraging me.

"Not that I have already obtained all this, or have been made perfect, but I press on to take hold of that for which Christ Jesus took hold of me. Brothers [and sisters], I do not consider myself yet to have taken hold of it. But one thing I do: Forgetting what is behind and straining toward what is ahead, I press on toward the goal to win the prize for which God has called me heavenward in Christ Jesus."