Let us tremble then at hearing this
parable. For indeed that fire is unquenchable. And how, it may be said, is it unquenchable? Do you see not this sun ever burning, and never quenched? Did you not behold the bush burning, and not consumed? If then you also desire to escape the flame, lay up
alms beforehand, and so you will not even taste of that fire. For if, while here, you will
believe what is told you, you shall not so much as see this furnace, after your departure into that region; but if you disbelieve it now, you shall
know it there full well by experience, when no sort of escape is possible. Since in
truth no entreaty shall avert the punishment from them who have not shown forth an upright life. For believing surely is not enough, since even the devils tremble at
God, but for all that they will be punished.
https://www.newadvent.org/fathers/200111.htm
1. And this is the passage regarding
demons. But now we must speak of Hades, in which the
souls both of the righteous and the unrighteous are detained. Hades is a place in the created system, rude, a locality beneath the earth, in which the light of the world does not shine; and as the sun does not shine in this locality, there must necessarily be perpetual darkness there. This locality has been destined to be as it were a guard-house for
souls, at which the
angels are stationed as guards, distributing according to each one's
deeds the temporary punishments for (different) characters. And in this locality there is a certain place set apart by itself, a lake of unquenchable fire, into which we suppose no one has ever yet been cast; for it is prepared against the day determined by
God, in which one sentence of righteous judgment shall be
justly applied to all. And the unrighteous, and those who
believed not
God, who have honoured as God the vain works of the hands of
men,
idols fashioned (by themselves), shall be sentenced to this endless punishment. But the righteous shall obtain the incorruptible and un-fading kingdom, who indeed are at present detained in Hades, but not in the same place with the unrighteous. For to this locality there is one descent, at the gate whereof we
believe an archangel is stationed with a host. And when those who are conducted by the
angels appointed unto the
souls have passed through this gate, they do not proceed on one and the same way; but the righteous, being conducted in the light toward the right, and being hymned by the
angels stationed at the place, are brought to a locality full of light. And there the righteous from the beginning dwell, not ruled by necessity, but enjoying always the
contemplation of the blessings which are in their view, and delighting themselves with the expectation of others ever new, and deeming those ever better than these.
https://www.newadvent.org/fathers/0520.htm