John 7:17

If any man wilt do his will, etc. - I will give you a sure rule by which ye may judge of my doctrine: If you really wish to do the will of God, begin the practice of it; and take my doctrine, and apply it to all that you know God requires of man; and if you find one of my precepts contrary to the nature, perfections, and glory of God, or to the present or eternal welfare of men, then ye shall be at liberty to assert that my doctrine is human and erroneous, and God has not sent me. But if, on the contrary, ye find that the sum and substance of my preaching is, That men shall love God with all their heart, soul, mind, and strength, and their neighbor as themselves; and that this doctrine must bring glory to God in the highest, while it produces peace and good will among men; then acknowledge that God has visited you, and receive me as the Messiah promised to your fathers.

If any man will do his will - Literally, if any man wills or is willing to do the will of God. If there is a disposition in anyone to do that will, though he should not be able perfectly to keep His commandments. To do the will of God is to obey His commandments; to yield our hearts and lives to His requirements. A disposition to do His will is a readiness to yield our intellects, our feelings, and all that we have entirely to Him, to be governed according to His pleasure.

He shall know - He shall have evidence, in the very attempt to do the will of God, of the truth of the doctrine. This evidence is internal, and to the individual it is satisfactory and conclusive. It is of two kinds.

1. He will find that the doctrines which Jesus taught are such as commend themselves to his reason and conscience, and such as are consistent with all that we know of the perfections of God. His doctrines commend themselves to us as fitted to make us pure and happy, and of course they are such as must be from God.

2. An honest desire to obey God will lead a man to embrace the great doctrines of the Bible. He will find that his heart is depraved and inclined to evil, and he will see and feel the truth of the doctrine of depravity; he will find that he is a sinner and needs to be born again; he will learn his own weakness, and see his need of a Saviour, of an atonement, and of pardoning mercy; he will feel that he is polluted, and needs the purifying influence of the Holy Spirit.

Thus, we may learn:

1. That an honest effort to obey God is the easiest way to become acquainted with the doctrines of the Bible.

2. Those who make such an effort will not cavil at any of the doctrines of the Scriptures.

3. This is evidence of the truth of revelation which every person can apply to his own case.

4. It is such evidence as to lead to certainty. No one who has ever made an honest effort to live a pious life, and to do all the will of God, has ever had any doubt of the truth of the Saviour's doctrines, or any doubt that his religion is true and is suited to the nature of man. They only doubt the truth of religion who wish to live in sin.

5. We see the goodness of God in giving us evidence of his truth that may be within every man's reach. It does not require great learning to be a Christian, and to be convinced of the truth of the Bible. It requires an honest heart, and a willingness to obey God.

Whether it be of God - Whether it be divine.

Or whether I speak of myself - Of myself without being commissioned or directed by God.

7:17 If any man be willing to do his will, he shall know of the doctrine, whether it be of God - This is a universal rule, with regard to all persons and doctrines. He that is thoroughly willing to do it, shall certainly know what the will of God is.