1:14a as you have already understood us in part,

as you (plur.) have partially understood us (excl.),
-or-
as you have partly understood ⌊why⌋ we ⌊did those things among you⌋

1:14b so that you may

(New International Version) that you can

that you can
-or-
so that you will

1:14c boast of us

boast about us
-or-
be proud of us

1:14d just as we will boast of you in the day of our Lord Jesus.

just as we can/will boast of you when the day of the Lord Jesus comes/occurs.
-or-
in the same way that we will be proud of you at the time when the Lord Jesus ⌊returns⌋.

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