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;
Arm --  is a military term for putting on heavy armor and preparing for battle. There is a spiritual conflict in our daily lives (cf. Ephesians 6:10 ff; Romans 13:12; 1 Thessalonians 5:8). - Utley