IMHO, Jonathan Edwards is fully on point in the dire warnings he provides. While God has shown unfathomable love to sinners in Christ, it is also an explicit truth of the Old and New Testament that God has continual wrath toward the wicked who refuse His mercy.
Psalm 5:7 Thou hatest all the workers of iniquity: Thou wilt destroy all that speak a lie. The bloody and the deceitful man the Lord will abhor.(Douay-Rheims)
John 3:36 He that believeth in the Son, hath life everlasting; but he that believeth not the Son, shall not see life; but the wrath of God abideth on him.(Douay-Rheims)
As to the very real and eternal expression of the wrath God toward the unrepentant sinner in hell–a long list of statements by Christ as well as the Apostles could be provided.
As a quick example of the Church’s teachings on the matter of God’s eternal wrath against sinners realized in hell–St. John Chrysostom:
“For when you hear of fire, do not suppose the fire in that world to be like this: for fire in this world burns up and makes away with anything which it takes hold of; but that fire is continually burning those who have once been seized by it, and never ceases: therefore also is it called unquenchable. For those also who have sinned must put on immortality, not for honor, but to have a constant supply of material for that punishment to work upon; and how terrible this is, speech could never depict, but from the experience of little things it is possible to form some slight notion of these great ones. For if you should ever be in a bath which has been heated more than it ought to be, think then, I pray you, on the fire of hell: or again if you are ever inflamed by some severe fever transfer your thoughts to that flame, and then you will be able clearly to discern the difference. For if a bath and a fever so afflict and distress us, what will our condition be when we have fallen into that river of fire which winds in front of the terrible judgment-seat. Then we shall gnash our teeth under the suffering of our labors and intolerable pains: but there will be no one to succor us: yea we shall groan mightily, as the flame is applied more severely to us, but we shall see no one save those who are being punished with us, and great desolation. And how should any one describe the terrors arising to our souls from the darkness? For just as that fire has no consuming power so neither has it any power of giving light: for otherwise there would not be darkness. The dismay produced in us then by this, and the trembling and the great astonishment can be sufficiently realized in that day only. For in that world many and various kinds of torment and torrents of punishment are poured in upon the soul from every side. And if any one should ask, and how can the soul bear up against such a multitude of punishments and continue being chastised through interminable ages, let him consider what happens in this world, how many have often borne up against a long and severe disease. And if they have died, this has happened not because the soul was consumed but because the body was exhausted, so that had the latter not broken down, the soul would not have ceased being tormented. When then we have received an incorruptible and inconsumable body there is nothing to prevent the punishment being indefinitely extended. For here indeed it is impossible that the two things should coexist. I mean severity of punishment and permanence of being, but the one contends with the other, because the nature of the body is perishable and cannot bear the concurrence of both: but when the imperishable state has supervened, there would be an end of this strife, and both these terrible things will keep their hold upon us for infinite time with much force. Let us not then so dispose ourselves now as if the excessive power of the tortures were destructive of the soul: for even the body will not be able to experience this at that time, but will abide together with the soul, in a state of eternal punishment, and there will not be any end to look to beyond this. How much luxury then, and how much time will you weigh in the balance against this punishment and vengeance? Do you propose a period of a hundred years or twice as long? And what is this compared with the endless ages? For what the dream of a single day is in the midst of a whole lifetime, that the enjoyment of things here is as contrasted with the state of things to come. Is there then any one who, for the sake of seeing a good dream, would elect to be perpetually punished? Who is so senseless as to have recourse to this kind of retribution?” (Ad Theod. 1.10)
Jonathan Edwards correctly speaks of the great opportunity we now have in Christ during this short time of mercy:
'Tis doubtless the case of some that heretofore you have seen and known, that never deserved hell more than you, and that heretofore appeared as likely to have been now alive as you: their case is past all hope; they are crying in extreme misery and perfect despair; but here you are in the land of the living, and in the house of God, and have an opportunity to obtain salvation. What would not those poor damned, hopeless souls give for one day’s such opportunity as you now enjoy!
And now you have an extraordinary opportunity, a day wherein Christ has flung the door of mercy wide open, and stands in the door calling and crying with a loud voice to poor sinners…"
What sermon?