"Children in school learn what we call definitions. A definition is an explanatory statement which tells us exactly what a certain thing is, as "an island is a tract of land completely surrounded by water." God also gives us definitions in His Word. We could cite hundreds of examples! He tells us exactly what certain things are. And in the passage quoted above God tells us exactly what the second death is. "And death and hell were cast into the lake of fire. THIS IS THE SECOND DEATH." Now let me make this a little plainer. Definitions of men can be given backward. For instance, the definition, "An island is a tract of land completely surrounded by water," can be given thus: "A tract of land completely surrounded by water is an island." This is but another way of stating the same fact. It does not, in any way, change the meaning."
"Now let us try this on the definition of the second death. The Bible states it thus: "Death and hell were cast into the lake of fire. This is the second death." Now let us turn this statement around for clarity. "The second death is death and hell cast into the lake of fire." Therefore we have exactly the same meaning either way it is stated. What is the second death? IT IS THE FIRST DEATH AND HELL CAST INTO THE LAKE OF FIRE! This fact is very important. Most Christians and nearly all preachers read the Word of God very superficially. They read and suppose that the second death is men being tortured forever in the lake of fire. Yet there is absolutely nothing in this passage about men! The verse that follows the one we are considering speaks of men being cast into the lake of fire. But not this one! It is the state of death and the condition of hell that are cast into the lake of fire. The second death is not men cast into the lake of fire, or men tormented or tortured forever. That’s not in the Book! The Holy Spirit has made it very simple and plain. The second death is the first death and hell cast into the lake of fire. That is the Holy Spirit’s definition, not mine."
Muxh more in the link:
https://www.godfire.net/eby/Rev/rev231.html
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https://www.godfire.net/Elwin/250-251_End_No_End_print.htm
Is There an END or NO END
To
"Everlasting" Punishment
And
"Eternal" Life
"And these shall go away into everlasting punishment: but the righteous into life eternal." Matthew 25:46.
"Due to the words, everlasting and eternal having been translated from the same Greek word, *aionios, this verse has been an ongoing debate for many years. One point has been made: If the punishment is only for an age, that is, age-lasting, there is an end to it. This would then mean that there would also be an end to life eternal that Jesus mentioned in the same breath. Another view is that neither will end. If there is no end to this life, there is also no end to the punishment. The same argument is held: Since aionios is used for both, and we believe this life never ends, the word surely means eternal; therefore, as it is life, the punishment never ends. This assumption logically has to stand firm for some to satisfy the thought of eternal life. *[aionios: perpetual from aion, an age (Strong's); aionios is the adjective form of aion and has been translated age, course, eternal, ever, for ever, for evermore, ever, never, world, beginning of the world, while the world, world began, world without end, and everlasting (KJV). Age-lasting and age-during (enduring the age) settles in as being to be the most accurate."
Much more in the link:
https://www.godfire.net/Elwin/250-251_End_No_End_print.htm