Forasmuch then as Christ suffered for us in the flesh, arm yourselves also with the same mind; for he who has suffered in the flesh has ceased from sin;
For he that hath suffered in the flesh hath ceased from sin - Compare the notes at Romans 6:7. To “suffer in the flesh” is to die. The expression here has a proverbial aspect, and seems to have meant something like this: “when a man is dead, he will sin no more;” referring of course to the present life. So if a Christian becomes dead in a moral sense - dead to this world, dead by being crucified with Christ (see the notes at Galatians 2:20) - he may be expected to cease from sin. The reasoning is based on the idea that there is such a union between Christ and the believer that his death on the cross secured the death of the believer to the world. Compare 2 Timothy 2:11; Colossians 2:20; Colossians 3:3.