Sin, a trap so easy to fall into. Cain yearned to be loved by God the way he thought his brother was loved by Him. Cain wanted to be what Abel was. Because of mans fall, the blindness Cain suffered from (seeing exactly how much God loved him) allowed Satan to plant in his heart the desire to remove Abel from the picture. Satan crouched, waiting for the perfect moment of Cain’s weakness and blindness, to pounce. Satan knew what life meant to God, how precious He viewed the creation of man, so he knew one way to hurt God was to use Cain’s weakness to kill Abel, so pounce He did.
What could Cain have done? He did not have a world of murder so he didn’t know what that meant. We don’t know a lot about his personal relationship with God, but we do know he didn’t have a bible to learn from. We know he didn’t have all of the good news God wants us to know because it wasn’t written yet, not that he would have known what writing was. But we do. And lean on it we must.
When Satan is crouching at our door, regardless of the temptation, we can lean on God and be confident He will see us through it. There are some musts, you must believe in God and you must believe in His Son, and you need to believe if God said it, God will do it.