“Si quis voluerit voluntatem ejus facere, cognoscet de doctrina, utrum ex Deo sit, an ego a meipso loquar.”
“If any man will do his will, he shall know of the doctrine, whether it be of God, or whether I speak of myself.”
“If anyone desires to do His will, he will know whether My teaching is from God or whether I speak on My own.”
“If anyone desires to do his will, he will know about the teaching, whether it is from God, or if I am speaking from myself.”
“If any man willeth to do his will, he shall know of the teaching, whether it is of God, or whether I speak from myself.”
[2.] That the most competent judges of the truth and divine authority of Christ's doctrine are those that with a sincere and upright heart desire and endeavour to do the will of God (v. 17): If any man be willing to do the will of God, have his will melted into the will of God, he shall know of the doctrine whether it be of God or whether I speak of myself. Observe here, First, What the question is, concerning the doctrine of Christ, whether it be of God or no; whether the gospel be a divine revelation or an imposture. Christ himself was willing to have his doctrine enquired into, whether it were of God or no, much more should his ministers; and we are concerned to examine what grounds we go upon, for, if we be deceived, we are miserably deceived. Secondly, Who are likely to succeed in this search: those that do the will of God, at least are desirous to do it. Now see, 1. Who they are that will do the will of God. They are such as are impartial in their enquiries concerning the will of God, and are not biassed by any lust or interest, and such as are resolved by the grace of God, when they find out what the will of God is, to conform to it. They are such as have an honest principle of regard to God, and are truly desirous to glorify and please him. 2. Whence it is that such a one shall know of the truth of Christ's doctrine. (1.) Christ has promised to give knowledge to such; he hath said, He shall know, and he can give an understanding. Those who improve the light they have, and carefully live up to it, shall be secured by divine grace from destructive mistakes. (2.) They are disposed and prepared to receive that knowledge. He that is inclined to submit to the rules of the divine law is disposed to admit the rays of divine light. To him that has shall be given; those have a good understanding that do his commandments, Ps 111 10. Those who resemble God are most likely to understand him.
Verses 14-24 Every faithful minister may humbly adopt Christ's words. His doctrine is not his own finding out, but is from God's word, through the teaching of his Spirit. And amidst the disputes which disturb the world, if any man, of any nation, seeks to do the will of God, he shall know whether the doctrine is of God, or whether men speak of themselves. Only those who hate the truth shall be given up to errors which will be fatal. Surely it was as agreeable to the design of the sabbath to restore health to the afflicted, as to administer an outward rite. Jesus told them to decide on his conduct according to the spiritual import of the Divine law. We must not judge concerning any by their outward appearance, but by their worth, and by the gifts and graces of God's Spirit in them.