13:9a In fact, we rejoice when we are weak but you are strong,

For we (excl.) rejoice when you (plur.) are strong even if we ourselves are weak,
-or-
We are glad to be weak ⌊in any way⌋ if it means that you are strong ⌊in faith⌋.

13:9b and our prayer is for your perfection.

and this is what we pray for, that you will be restored to perfection.
-or-
We also pray for you like this: May God enable you to be completely faultless ⌊in faith⌋.

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