17 Ἐάν τις θέλῃ τὸ θέλημα αὐτοῦ ποιεῖν, γνώσεται περὶ τῆς διδαχῆς, πότερον ἐκ τοῦ Θεοῦ ἐστιν, ἢ ἐγὼ ἀπ᾿ ἐμαυτοῦ λαλῶ.
18 Ὁ ἀφ᾿ ἑαυτοῦ λαλῶν, τὴν δόξαν τὴν ἰδίαν ζητεῖ· ὁ δὲ ζητῶν τὴν δόξαν τοῦ πέμψαντος αὐτόν, οὗτος ἀληθής ἐστι, καὶ ἀδικία ἐν αὐτῷ οὐκ ἔστιν.