5:17 {11} Therefore if any man [be] in Christ, [he is] a {o} new creature: old things are passed away; behold, all things are become new.
(11) An exhortation for every man who is renewed with the Spirit of Christ to meditate on heavenly things, and not earthly.
(o) As a thing made new by God, for though a man is not newly created when God gives him the spirit of regeneration, but only his qualities are changed, yet nonetheless it pleased the Holy Spirit to speak so, to teach us that we must attribute all things to the glory of God. Not that we are as rocks or stones, but because God creates in us both the will to will well, and the power to do well.
5:17 If any man [be] in Christ, [he is] a new creature. Because, crucified with Christ, buried into his death, we have died with Christ, and risen to walk in a new life (Ro 6:6,4,14). Born anew, we are new creatures who must live a new life.
Old things are passed away. The old life ended when we died and were buried.
All things have become new. The affections, the motives, the thoughts, the hopes, the whole life.
5:17 Therefore if any one be in Christ - A true believer in him. There is a new creation - Only the power that makes a world can make a Christian. And when he is so created, the old things are passed away - Of their own accord, even as snow in spring. Behold - The present, visible, undeniable change! All things are become new - He has new life, new senses, new faculties, new affections, new appetites, new ideas and conceptions. His whole tenor of action and conversation is new, and he lives, as it were, in a new world. God, men, the whole creation, heaven, earth, and all therein, appear in a new light, and stand related to him in a new manner, since he was created anew in Christ Jesus.
5:16-21 The renewed man acts upon new principles, by new rules, with new ends, and in new company. The believer is created anew; his heart is not merely set right, but a new heart is given him. He is the workmanship of God, created in Christ Jesus unto good works. Though the same as a man, he is changed in his character and conduct. These words must and do mean more than an outward reformation. The man who formerly saw no beauty in the Saviour that he should desire him, now loves him above all things. The heart of the unregenerate is filled with enmity against God, and God is justly offended with him. Yet there may be reconciliation. Our offended God has reconciled us to himself by Jesus Christ. By the inspiration of God, the Scriptures were written, which are the word of reconciliation; showing that peace has been made by the cross, and how we may be interested therein. Though God cannot lose by the quarrel, nor gain by the peace, yet he beseeches sinners to lay aside their enmity, and accept the salvation he offers. Christ knew no sin. He was made Sin; not a sinner, but Sin, a Sin-offering, a Sacrifice for sin. The end and design of all this was, that we might be made the righteousness of God in him, might be justified freely by the grace of God through the redemption which is in Christ Jesus. Can any lose, labour, or suffer too much for Him, who gave his beloved Son to be the Sacrifice for their sins, that they might be made the righteousness of God in him?