In 2 Peter 3:18 — we read, “Grow in the grace and knowledge of our Lord and Savior Jesus Christ. To him be glory both now and forever! Amen.”
The Greek verb translated “grow” is in what’s called the “present imperative active” tense. That is to say, the apostle Peter is commanding us to continually be growing as a matter of habit.
Grace is sometimes made to sound as if it is some wonderful, ethereal spiritual substance somewhere out there that we ingest. Frankly, the grace of God is simply God in action. In other words, the grace of our Lord Jesus is Jesus at his work.
So when we read we are to grow in the grace of Jesus, we could paraphrase it to say, grow in allowing Jesus to work more freely and completely in your heart. Let him be increasingly in charge of what you think about and the decisions you make. That would mean that you are growing in his grace — in his activity in you.
And in addition, grow in the knowledge of our Lord as well. In other words, be constantly doing what you already know would help you get to know him better.