Consequently, we Christians must also be made like Him in life. Therefore we must no longer commit sins, but serve God, having once for all died to sin. So also Jesus Christ Himself died for sin once and rose in order thereafter to live eternally and reign over death.
In the teaching on baptism here, it is worthy of attention that baptism is called death to sin. Its image is expressed more clearly in baptism by immersion, whereas in baptism by pouring it is impossible even to represent the image of death and burial.
According to one interpreter, “In baptism it is the same as if someone prepared a chemical compound which, when unclean linen or clothing is immersed in it, immediately dissolves and consumes every impurity. Only immerse it, and every impurity will be consumed.
So also the death of Christ, as the cleansing power of sin, consumes every sin as soon as one is immersed into this death through baptism. But one must keep in mind that in this death to sin through baptism nothing happens mechanically. Everything is accomplished with the participation of the moral and free resolve of the man himself.
The essence of death to sin is always one thing: aversion from sin, a deadly hatred of it.”
“But hatred and aversion are always formed in the soul in such a way that, turning away from one thing, it turns toward something opposite. According to this law, turning away from sin, it turns toward righteousness and holiness and loves them. This love of righteousness and holiness is the new life.”
“This new life is accomplished graciously and sacramentally, yet freely and willingly” (Theophan).
Explaining the meaning of the words of verse 5, “conformed,” or “planted together,” “to His death,” St. John Chrysostom says: “The Apostle understands two forms of mortification here. One is accomplished by Christ in baptism, and the other we ourselves are obliged to accomplish by our own diligence after baptism.
As, for the blotting out of former sins, you for your part used faith, so, in order not to be defiled by sins after baptism, show a change in disposition.”