John Calvin Commentary John 7:18

"He that speaketh from himself seeketh his own glory: but he that seeketh the glory of him that sent him, the same is true, and no unrighteousness is in him." — John 7:18 (ASV)

He who speaketh from himself. Until now, he has shown that there is no other reason for men's blindness than their not being governed by the fear of God. He now points to another distinguishing feature of the doctrine itself, by which it can be determined whether it is from God or from man.

For everything that displays the glory of God is holy and divine; but everything that contributes to the ambition of men and, by exalting them, obscures the glory of God, not only has no claim to be believed, but ought to be vehemently rejected. He who makes the glory of God his aim will never go wrong; he who tests by this touchstone what is presented in the name of God will never be deceived by the mere appearance of what is right.

We are also reminded by this principle that no one can faithfully discharge the office of a teacher in the Church unless he is devoid of ambition and resolves to make it his sole object to promote, to the best of his ability, the glory of God. When it is said that there is no unrighteousness in him, this means that there is nothing wicked or hypocritical in such a person, but that he does what befits an upright and sincere minister of God.