3:10 And have put on the new [man], {8} which is renewed in {e} knowledge after the image of him that created him:
(8) Newness of life consists in knowledge which transforms man to the image of God his maker, that is to say to the sincerity and pureness of the whole soul.
(e) He speaks of an effectual knowledge.
3:10 Have put on the new [man]. Are born again and become new creatures in Christ (Joh 3:5). The new man has a new heart, new thoughts, a new life.
Which is renewed in knowledge. With the new man there is a growth, a renewal. He grows continually in knowledge of Christ and into his image.
3:10 In knowledge - The knowledge of God, his will, his word.
3:5-11 It is our duty to mortify our members which incline to the things of the world. Mortify them, kill them, suppress them, as weeds or vermin which spread and destroy all about them. Continual opposition must be made to all corrupt workings, and no provision made for carnal indulgences. Occasions of sin must be avoided: the lusts of the flesh, and the love of the world; and covetousness, which is idolatry; love of present good, and of outward enjoyments. It is necessary to mortify sins, because if we do not kill them, they will kill us. The gospel changes the higher as well as the lower powers of the soul, and supports the rule of right reason and conscience, over appetite and passion. There is now no difference from country, or conditions and circumstances of life. It is the duty of every one to be holy, because Christ is a Christian's All, his only Lord and Saviour, and all his hope and happiness.
