Col 3:10 And have put on the new man, which is being renewed unto full knowledge according to the image of Him who created him.
The problem with the Colossians was that they had the wrong kind of knowledge. In [Colossians] 2:8 Paul speaks of philosophies that are according to the tradition of men and according to the elements of the world, but not according to Christ. Now in 3:10 he speaks of full knowledge according to the image, the expression, the fullness, of God.
Concerning the new man, our mind needs to be renewed unto such a full knowledge according to the Christ who is the expression of the invisible God. Our mind needs to be renewed to such an extent that we have a clear view of Christ as the image of God. Few Christians have a proper understanding of the Christ unveiled in the book of Colossians.
Their minds have not been renewed unto such a full knowledge of Him. As a result, many Christians today have been misled, deluded, and defrauded, just as the Colossians were. When our mind is filled with the knowledge of the all- inclusive Christ, our emotion will be influenced.
This will cause us to have a greater appreciation of the Lord Jesus. For example, a child may have a greater appreciation for a velvet box than for the diamond ring in the box. In the child's mind there is no knowledge of the value of the diamond ring.
But as the child grows, he will have a greater appreciation for the ring. Eventually, he will want to keep the ring and throw the box away.