I do not cease giving thanks for you making mention in my prayers that the God of our Lord Jesus Christ, the Father of glory gives you a spirit of wisdom and revelation in knowing him (Ephesians 1:16-17)To know him is a blessing, it is given to us to know the mysteries of the king of God.* This is what God planned in Christ before he created the world and what he is making known to us, the mystery of his will, which he set forth in Christ, as a plan for the fullness of time to bring all together in Christ.
... gives you a spirit of wisdom and revelation in knowing more of him...
Some translations translate this verse as knowing more of him. The spiritual blessings of being chosen, predestined for adoption, favored in the beloved, redeemed, and being marked as his own by the Spirit are all given to us in Christ. God is and wants to make known to us these blessings, this is a part of our identity, knowing who we are in Christ.
Paul prays that we know him, having a spirit of wisdom and revelation in knowing him, but we already know him through the blessings mentioned before, so we can say it is to know more of him. And knowing more of him is knowing more of who we are, as we are known in Christ (1 Corinthians 13:12). Knowing more of him, and who we are, makes the things of this world grow strangely dim.
A spirit of wisdom and revelation in knowing more of him enlightens the eyes of our hearts so we know the hope of our calling, the riches of his glory, our inheritance among the saints, and the greatness of his power available to us who believe. So we pray, may God give us a spirit of wisdom and revelation in knowing him so we know more of the blessings we have in him and more of who we are in him.