Be sober and self-controlled. Be watchful. Your adversary the devil, walks around like a roaring lion, seeking whom he may devour.
because your adversary the devil: The enemy is real! He is (or at least was to first century Christians) a well-known adversary. In this trial to death, Satan accuses us, opposes us and would sift us as wheat (Zechariah 3:1). Oh how well Peter knew this lesson!