22 Question IV. Let us, in the next place, consider what he has laid down concerning the proportion between sin and punishment when, misrepresenting the gospel, he says: “Christ threatens eternal punishment to those who do not believe in Him;” and yet He says in another place, “With what measure ye mete, it shall be measured to you again.” “Here,” he remarks, “is something sufficiently absurd and contradictory; for if He is to award punishment according to measure, and all measure is limited by the end of time, what mean these threats of eternal punishment?”
Source: Letters (New Advent)