 And no one is immune. Second lesson. No one is immune from the damaging consequences of sin. So you're not immune to committing terrible, horrible sin. That's why you have to guard your heart. You have to be on the alert. Your adversary, the devil, prowls around like a roaring lion, seeking whom he may devour. You have an enemy within, and that enemy is called the flesh. And that flesh wants to murder and lust and steal and do all these terrible things and gossip and be bitter. You're flesh inside.