Dear friends, I urge you, as aliens and strangers in the world, to abstain from sinful desires, which war against your soul.
In the book of Genesis, just before Cain goes to kill his brother Abel, and in so doing, commit the very first murder, God comes to Cain. He notices that Cain is angry, then says, "Why are you angry? Why is your face downcast? If you do what is right, will you not be accepted? But if you do not do what is right, sin is crouching at your door; it desires to have you, but you must master it."
That comment has always stuck with me. That sin is described as something that is crouching. That sin is something that wants to overtake me. That it desires.
Peter here gives a straight forward response to this. He simply states, "...abstain."
We are not long for this world, and if you are a child of God, you don't even belong here! You can master sin, because of the power of Christ. So, abstain from those sinful desires. They are warring against your soul.