Endurance
Every human being is created by God, and is His. That mortal may choose otherwise at some point, leading their bad decisions straight to hell. Where the gift they received is snatched away with cruelty by an unforgiving, twisted, horrible entity. No matter how hard Satan tries, and often accomplishes his quest for snatching souls, he must jump through hoops in order to attain them. He is in the second hand store of life, where the Souls are once owned totally by our God. He can never, ever, claim them from the beginning. For God is our Creator. In all his wicked efforts, Satan must go to work effortlessly and I think this is one of the reasons why he's so angry. He knows he will never ever, ever be God, so he has to wear down, and prod endlessly. Weakening one to the point of giving in to his evil promises. Renounce him immediatel!, and give your soul back to God where it is safe.
That is why it is so important to stay in the State of Grace. To never stop trying. To fight the good fight. Never giving up. The moment the evil one sees his chance, he will attack. But God is unbeatable. Our Souls belong to God. We know it. The Saints knew it. The Poor Souls in Purgatory know it. And the evil one knows it also.
Be steadfast. ALWAYS cleansing your Soul from sin. Wash it clean in the cleansing renewal of Confession. Tell our Jesus that you are His and His you wish to be. That you live forever for your Soul to be His and His alone.
Our Souls belong to God. ALWAYS have, and ALWAYS will be. Period.