The second death
And he not only sees, but feels in himself, by an emotion of soul which he cannot describe, that for the sins of his heart, were his life without blame, which yet it is not, and cannot be, seeing an evil tree cannot bring forth good fruit, he deserves to be cast into the fire that never shall be quenched. He feels that the wages, the just reward of sin, of his sin above all, is death, even the second death, the death which does not die, the destruction of body and soul in hell.
1771 text
5. And he not only sees, but feels in himself, by an emotion of soul which he cannot describe, that for the sins of his heart, were his life without blame, (which yet it is not, and cannot be: seeing an evil tree cannot bring forth good fruit) he deserves to be cast into the fire that never shall be quenched. He feels, that the wages, the just reward of sin, of his sin above all, is death; even the second death, the death which dieth not, the destruction of body and soul in hell.