This is the same disciple who offers testimony about these things, and who has written these things. And we know that his testimony is true. (Jhn 21,24)
Οὗτός ἐστιν ὁ μαθητὴς ὁ μαρτυρῶν περὶ τούτων καὶ ὁ γράψας ταῦτα, καὶ οἴδαμεν ὅτι ἀληθὴς αὐτοῦ ἡ μαρτυρία ἐστίν.
Hic est discipulus ille, qui testimonium perhibet de his, et scripsit hæc: et scimus, quia verum est testimonium eius.