12:21a I am afraid that when I come again, my God will humble me before you,

I fear that when I come again, God will humble me in your (plur.) presence,
-or-
I am concerned/worried that when I come ⌊to visit you⌋, God will shame me as I stand before you ⌊over the disobedience I will see⌋.

12:21b and I will be grieved over many who have sinned earlier

and I will mourn about many ⌊of you⌋ who sinned previously
-or-
And I will weep as if over a dead loved one for any of you who sinned before

12:21c and have not repented of their acts of impurity, sexual immorality,

and have not repented of the perverse sex, sexual immorality,
-or-
but have not changed their thinking about the dirty/impure sex, other sexual sin,

12:21d and debauchery.

and life of lust that they practiced.
-or-
and their continual desiring/seeking of sex.

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