Therefore, since Christ suffered in his body, arm yourselves also with the same attitude, because whoever suffers in the body is done with sin. As a result, they do not live the rest of their earthly lives for evil human desires, but rather for the will of God. For you have spent enough time in the past doing what pagans choose to do—living in debauchery, lust, drunkenness, orgies, carousing and detestable idolatry. They are surprised that you do not join them in their reckless, wild living, and they heap abuse on you. But they will have to give account to him who is ready to judge the living and the dead. For this is the reason the gospel was preached even to those who are now dead, so that they might be judged according to human standards in regard to the body, but live according to God in regard to the spirit.
What is referred to here is not God-given human desires, but such desires twisted because of sin. Instead we’re to live the rest of our lives for and in the will of God. That’s to be our goal, what characterizes our lives. The norm of how we live from day to day.
We arm ourselves when we’re willing to suffer for God’s will. Christ set the example which we’re to follow in his suffering for us (1 Peter 2:21). We want to avoid any martyr complex. Just living simply according to God’s will as followers of Christ will get us into enough difficulty. Saying no to our own sinful inclinations, and yes to whatever God’s will is. In the way of Christ, in and through him.