The Assurance of Perseverance

Arminians like to argue against the biblical doctrine of perseverance by citing the biblical warnings against apostasy. Those warnings truly exist; no Calvinist would say otherwise. The problem is that the Arminian argues further that the existence of the warning logically requires that the apostasy of true believers must be possible. To that the Calvinist objects as an unwarranted leap of logic. 

"That a righteous man may fall is evident. And as evident it is that he cannot fall finally. For, though he fall seven times in a day, as often does he rise again, Proverbs 24:16, and this because 'the Lord upholdeth him with His hand,' Psalm 37:24, and again, 'the Lord upholdeth all that fall,' Psalm 145:14. That is, either He stays them when they are falling, or so orders and limits the matter that they fall not into mischief, as others do, and, to be sure, He will set them on their feet again. The absolute promise cannot be nullified or made uncertain by cautionary words elsewhere delivered" -- Puritan Elisha Coles, A Practical Discourse of God's Sovereignty. Coles continues, "The Lord does ordinarily bring about His purposes by means, of which cautions are a part. And by which, as a means, He keeps off the evil cautioned against."

Coles' point, which is an important one, is that God's warnings of the consequences of apostasy are one of the means by which He prevents the elect from experiencing those consequences. It is like the parent of a small child, who warns against touching the hot stove. The parent expects his warning to prevent that against which he has warned. Yet the Arminian wants us to believe that the parent's warning implies that the child will, then, proceed to touch the stove and get burned. Not only does the parent have no such expectation,  but God even less so, because He has effectual means for maintaining the faith of the true believer.