The greater part of the New Testament (the epistles) owes its origin to the mischief Satan did in the Church. The mischief was only permitted that the folly of these things might be made manifest, and that the full glory of the truth might be brought out. "These things have I written unto you concerning them that seduce you." The things here written of are what some pretenders held; they were persons of the highest pretensions that would seduce them. Not the gospels of course, but the great body of the epistles, of which those to the Thessalonians, Corinthians and Galatians are examples, were occasioned by the mischief the adversary brought in.
The attack of the enemy brought out in the epistle to the Corinthians the truth of the resurrection, in Thessalonians the coming of the Lord, in Galatians justification by faith. This was hardly the case in Philippians, because Paul was comforted by the love of those at Philippi. It is the same in regard to the mischief he has done from the beginning. The fall itself is the occasion of God's introducing greater blessing than before.
Whatever Satan seeks to do, as he has done from the beginning, must ultimately tend to the divine glory, and the comfort and blessing of our souls, who seek to serve God. Of course man gets humbled in it, but God overrules it for greater good.