that is, that I with you may be comforted in you, each of us by the other’s faith, both yours and mine.

that is, that you and I may be mutually encouraged by each other’s faith.

and that is, that I may be comforted together among you, through the faith in one another, both yours and mine.

that is, to have mutual comfort among you, each by the faith [which is] in the other, both yours and mine.