To harden the heart when we are being dealt with leniently, when mercy is being extended to us and we are being given further opportunity to repent, even when we are being punished less severely than we deserve because there is no wish to destroy us but to bring us to our senses – to persist in a path of evil under these circumstance is a very dangerous thing to do. We are not in control of the leniency being shown us; it is completely in the hands of another.
When therefore God’s patience with sinners is exhausted – and eventually it certainly will be, for although God’s mercy endures forever towards his elect, it has a limit towards the reprobate – when that happens, it will be sudden and without remedy. What would be the purpose of mercy being extended anymore? No change is ever going to come about. The number of the elect gathered into the kingdom will be complete, and there is no reason why Christ glorious kingdom should be delayed any longer. There is no remedy from this final collapse, or as the Hebrew says, there is no healing. Let nobody vainly hope that God will change his mind; he cannot change once he has exercised his verdict. Even a human judge would never do such a thing, much less the God who has warned the human race for thousands of years that this day would come. Let us then repent early and settle matters with our divine adversary quickly, ‘whiles thou art in the way with him; lest at any time the adversary deliver thee to the judge, and the judge deliver thee to the officer, and thou be cast into prison’ (Matthew 5:25). Does God have emotions? The lost will discover that he does, though not like human emotions. They will discover that they have a personal enemy who is infinitely angry with them and his anger will never be pacified. But the elect will discover that they are the objects of his everlasting love.