The further references I provided were to help you and any others who are interested in the biblical teaching on "eternal death/damnation/punishment" and how notable and reliable believers have understood that doctrine. Confessionally, the "Eternal Constant Torment" has been the vast majority view among at least in Reformed/Calvinist/Protestant churches.
I realize the following is very simple, but hermeneutically relevant but is certainly problematic for those who reject ECT:
Mark 3:29 (KJV) 29 But he that shall blaspheme against the Holy Ghost hath never forgiveness, but is in danger of eternal damnation:
John 3:15 (KJV) 15 That whosoever believeth in him should not perish, but have eternal life.
The Greek word "eternal" in both texts is
aionios. If "eternal life" which Christ secured for the elect is forever, without end, continuous, then it is likewise true that "eternal damnation" is forever, without end, continuous. There is no way to avoid that fact.
The issue I have concluded with those who reject ECT is not one based upon the "Analogy of Faith" where the didactic portions of Scripture of the matter are the foundation of knowledge, but rather a presupposition upon "logic", "emotion" or a combination of both, e.g., "If God is the God of all love and mercy, then eternal punishment is impossible." The same time of "illogic" is used when the subject of the end of infants who die in infancy. Paul, by the direct inspiration of God, makes it perspicuous as to the condition of ALL mankind when he wrote: Romans 5:12 (KJV) ["i]Wherefore, as by one man sin entered into the world, and death by sin; and so death passed upon all men, for that all have sinned: ... 18 Therefore as by the offence of one [judgment came] upon all men to condemnation; even so by the righteousness of one [the free gift came] upon all men unto justification of life. 19 For as by one man's disobedience many were made sinners, so by the obedience of one shall many be made righteous."[/i] Thus, ALL human beings die because they are ALL sinners and thus under the just wrath and judgment of God unto damnation UNLESS the Spirit brings a sinner to Christ by faith. The "love and mercy of God" isn't universal for any group but to individuals whom from all eternity God has predestined to salvation in Christ. The fact that ANYONE is shown mercy and saved is beyond comprehension, but it is true that some are indeed rescued from eternal death.
ALL who are cast into hell and the Lake of Fire are deserving of eternal torment as all others (cf. Eph. 2:2,3). The eternal torment that is awaiting all who are outside of Christ is the same eternal punishment and torment which Christ endured on the cross for those whom the Father ordained to be saved by Him. Rejecting ECT isn't something that affects men, but it also has serious implications on all the foundational doctrines of the Christian faith; the Fall, the infinite holiness of God, God's immutable sovereignty, the incomprehensible love and mercy of God, true justice, the atonement of Christ, the depth of love for His elect, the affections of the believer's heart and the expression of true worship, et al.