Since therefore Christ suffered in the flesh, arm yourselves with the same way of thinking, for whoever has suffered in the flesh has ceased from sin, so as to live for the rest of the time in the flesh no longer for human passions but for the will of God. (1 Peter 4:1, 2 ESV)
Notes from ESV: Peter's point is that when believers are willing to suffer, the nerve center of sin is severed in their lives. Michelle and I can both attest to this! Although believers will never be totally free from sin in this life, when believers endure suffering for the sake of Christ they show that their purpose in life is not to live for their pleasures but according to the will of God and for his glory.