Luk 22:31-32, 31 And the Lord said, “Simon, Simon! Indeed, Satan has asked for you, that he may sift you as wheat. 32 But I have prayed for you, that your faith should not fail; …
Satan’s oppression is seen taking effect with Peter but Jesus is controlling the thermostat only permitting Satan as an agent to sift Peter.
So why was Satan allowed in Peter’s case? To quote Zac Poonen “… Jesus didn’t pray that Peter should not fall in temptation, but that when he did fall, his faith in God’s perfect love would not fail him so that even when Peter reached the bottom of the pit of failure, he would confess, “God still loves me”. That is faith – and that is the confession we must always have on our lips and in our hearts – no matter how low we may have sunk or fallen – that God still loves us, just as we are,…The Lord uses Satan to remove the chaff from our lives to accomplish His purpose. Only through many experiences of failure do we finally reach a “zero point”, where we’re truly broken”