2 Peter 3.18 speaks of growing in the "grace AND knowledge of our Lord and Savior Jesus Christ."
Grace is active, knowledge feeds grace...or should...
But some, to drag out the cliche, grow so deep in the things of God they do nothing for the kingdom of God. Others are hyperactive, "zealous without knowledge."
Paul's prayer in Colossians brings balanced perspective:
"And so, from the day we heard, we have not ceased to pray for you, asking that you may be filled with the knowledge of His will in all spiritual wisdom and understanding, so as to walk in a manner worthy of the Lord, fully pleasing to Him,bearing fruit in every good work, and increasing in the knowledge of God."
Paul prays for increased knowledge that results/feeds/causes increased Christ-like living.
Ah, too bad the only way to learn balance is to lose it...