And that simply means "The person who sins will die". Therefore all human beings die and also face the second death. But the soul is imperishable and death means separation. The second death is eternal separation from God.
Where do you find the soul can't die? Also all humans won't die .The 2nd death is the death of who you are,meaning your very soul.
look what happens to satan
Ezekiel 28:18
"Thou hast defiled thy sanctuaries by the multitude of thine iniquities, by the iniquity of thy traffick; therefore will I bring forth a fire from the midst of thee, it shall devour thee, and I will bring thee to ashes upon the earth in the sight of all them that behold thee."
Ezekiel 28:19
"All they that know thee among the people shall be astonished at thee: thou shalt be a terror, and never shalt thou be any more."
Now did that verse say you will be forever seperated from God,no it didn't!!!!