In his lectures on the theology of Jonathan Edwards, John H. Gerstner states that Edwards did not exaggerate the wrath of God in his sermons, nor could Edwards ever have exaggerated His wrath, pointing out that the sermon titled The Justice of God in the Damnation of Sinners was considered by Edwards to be the most blessed sermon by God which he had ever preached.
Here is an excerpt from the sermon:
If we consider the infinite evil and heinousness of sin in general, it is not unjust in God to inflict what punishment is deserved; because the very notion of deserving any punishment is, that it may be justly inflicted…Every crime or fault deserves a greater or less punishment, in proportion as the crime itself is greater or less. If any fault deserves punishment, then so much the greater the fault, so much the greater is the punishment deserved…A crime is more or less heinous, according as we are under greater or less obligations to the contrary…Our obligation to love, honour, and obey any being, is in proportion to his loveliness, honourableness, and authority; for that is the very meaning of the words…So that sin against God, being a violation of infinite obligations, must be a crime infinitely heinous, and so deserving of infinite punishment.
You can read it in full here.