# I myself have yet taken hold of it

"all these things belong to me yet" 

# Forgetting what is behind and straining forward to what is ahead,

"I do not care what I have done in the past; I only work as hard as I can on what is ahead.". Like a runner in a race is no longer concerned about what is completed but on what is ahead; Paul speaks of setting aside his religious works of righteousness and only focusing on the race of life that Christ has set before him to complete.