There's no post death repentance
Iirc this is actually plainly explained in Clements book.
Ch 8 --THE NECESSITY OF REPENTANCE WHILE WE ARE ON EARTH.
As long, therefore, as we are upon earth, let us practise repentance, for we are as clay in the
hand of the artificer. For as the potter, if he make a vessel, and it be distorted or broken in his
hands, fashions it over again; but if he have before this cast it into the furnace of fire, can no
longer find any help for it: so let us also, while we are in this world, repent with our whole heart
of the evil deeds we have done in the flesh, that we may be saved by the Lord, while we have
yet an opportunity of repentance. For after we have gone out of the world, no further power of
confessing or repenting will there belong to us. Wherefore, brethren, by doing the will of the
Father, and keeping the flesh holy, and observing the commandments of the Lord, we shall
obtain eternal life. For the Lord saith in the Gospel, "If ye have not kept that which was small,
who will commit to you the great? For I say unto you, that he that is faithful in that which is
least, is faithful also in much." This, then, is what He means: "Keep the flesh holy and the seal
undefiled, that ye may receive eternal life.”
Ch 9 --WE SHALL RE JUDGED IN THE FLESH.
And let no one of you say that this very flesh shall not be judged, nor rise again. Consider ye in
what [state] ye were saved, in what ye received sight, if not while ye were in this flesh. We must
therefore preserve the flesh as the temple of God. For as ye were called in the flesh, ye shall
also come [to be judged] in the flesh. As Christ the Lord who saved us, though He was first a
Spirit became flesh, and thus called us, so shall we also receive the reward in this flesh. Let us
therefore love one another, that we may all attain to the kingdom of God. While we have an
opportunity of being healed, let us yield ourselves to God that healeth us, and give to Him a
recompense. Of what sort? Repentance out of a sincere heart; for He knows all things
beforehand, and is acquainted with what is in our hearts. Let us therefore give Him praise, not
with the mouth only, but also with the heart, that tie may accept us as sons. For the Lord has
said, "Those are my brethren who do the will of my Father.”
Ch 10 --VICE IS TO BE FORSAKEN, AND VIRTUE FOLLOWED.
Wherefore, my brethren, let us do the will of the Father who called us, that we may live; and let
us earnestly follow after virtue, but forsake every wicked tendency which would lead us into
transgression; and flee from ungodliness, lest evils overtake us. For if we are diligent in doing
good, peace will follow us. On this account, such men cannot find it [i.e. peace] as are
influenced by human terrors, and prefer rather present enjoyment to the promise which shall
afterwards be fulfilled. For they know not what torment present enjoyment recurs, or what
felicity is involved in the future promise. And if, indeed, they themselves only aid such things, it
would be [the more] tolerable; but now they persist in imbuing innocent souls with their
pernicious doctrines, not knowing that they shall receive a double condemnation, both they
and those that hear them.
Ch 11 --WE OUGHT TO SERVE GOD, TRUSTING IN HIS PROMISES.
Let us therefore serve God with a pure heart, and we shall be righteous; but if we do not serve
Him, because we believe not the promise of God, we shall be miserable. For the prophetic
word also declares, "Wretched are those of a double mind, and who doubt in their heart, who
say, All these things have we heard even in the times of our fathers; but though we have waited
day by day, we have seen none of them [accomplished]. Ye fools! compare yourselves to a
tree; take, for instance, the vine. First of all it sheds its leaves, then the bud appears; after that
the sour grape, and then the fully-ripened fruit. So, likewise, my people have borne
disturbances and afflictions, but afterwards shall they receive their good things." Wherefore