That is, that I may be comforted together with you by the mutual faith both of you and me.
Berean Study Bible (BSB) - Romans 1:12 >that is, that you and I may be mutually encouraged by each other’s faith.
Textus Receptus (TR) - Romans 1:12 >τοῦτο δέ ἐστι, συμπαρακληθῆναι ἐν ὑμῖν διὰ τῆς ἐν ἀλλήλοις πίστεως ὑμῶν τε καὶ ἐμοῦ.