Philippians 3:13-15:

Brethren, I count not myself to have apprehended: but this one thing I do, forgetting those things which are behind, and reaching forth unto those things which are before,
I press toward the mark for the prize of the high calling of God in Christ Jesus.
Let us therefore, as many as be perfect, be thus minded: and if in any thing ye be otherwise minded, God shall reveal even this unto you.

See also:

Doesn’t 1 John 3:22 Prove That Our Ability to Receive Depends on How Well We Keep God’s Commandments?
Should I Ask God to Use Me or to Make Me Usable?
Mistake: Going on a Witch Hunt for Mistakes