If any man wish to do his will. He anticipates the objections that might be made. For since he had many adversaries in that place, some one might readily have murmured against him in this manner: "Why dost thou boast to us of the name of God? For we do not know that thou hast proceeded from him. Why, then, dost thou press upon us that maxim, which we do not admit to thee, that thou teachest nothing but by the command of God?" Christ, therefore, replies that sound judgment flows from fear and reverence for God; so that, if their minds be well disposed to the fear of God, they will easily perceive if what he preaches be true or not. He likewise administers to them, by it, an indirect reproof; for how comes it that they cannot distinguish between falsehood and truth, [1] but because they want the principal requisite to sound understanding, namely, piety, and the earnest desire to obey God? This statement is highly worthy of observation. Satan continually plots against us, and spreads his nets in every direction, that he may take us unawares by his delusions. Here Christ most excellently forewarns us to beware of exposing ourselves to any of his impostures, assuring us that if we are prepared to obey God, he will never fail to illuminate us by the light of his Spirit, so that we shall be able to distinguish between truth and falsehood. Nothing else, therefore, hinders us from judging aright, but that we are unruly and headstrong; and every time that Satan deceives us, we are justly punished for our hypocrisy. In like manner Moses gives warning that, when false prophets arise, we are tried and proved by God; for they whose hearts are right will never be deceived, (Deuteronomy 13:3.) Hence it is evident how wickedly and foolishly many persons in the present day, dreading the danger of falling into error, by that very dread shut the door against all desire to learn; as if our Savior had not good ground for saying, Knock, and it shall be opened to you, (Matthew 7:7.) On the contrary, if we be entirely devoted to obedience to God, let us not doubt that He will give us the spirit of discernment, to be our continual director and guide. If others choose to waver, they will ultimately find how flimsy are the pretences for their ignorance. And, indeed, we see that all who now hesitate, and prefer to cherish their doubt rather than, by reading or hearing, to inquire earnestly where the truth of God is, have the hardihood to set God at defiance by general principles. One man will say that he prays for the dead, because, distrusting his own judgment, he cannot venture to condemn the false doctrines invented by wicked men about purgatory; and yet he will freely allow himself to commit fornication. Another will say that he has not so much acuteness as to be able to distinguish between the pure doctrine of Christ and the spurious contrivances of men, but yet he will have acuteness enough to steal or commit perjury. In short, all those doubters, who cover themselves with a veil of doubt in all those matters which are at present the subject of controversy, display a manifest contempt of God on subjects that are not at all obscure. We need not wonder, therefore, that the doctrine of the Gospel is received by very few persons in the present day, since there is so little of the fear of God in the world. Besides, these words of Christ contain a definition of true religion; that is, when we are prepared heartily to follow the will of God, which no man can do, unless he has renounced his own views. Or if I speak from myself. We ought to observe in what manner Christ wishes that a judgment should be formed about any doctrine whatever. He wishes that what is from God should be received without controversy, but freely allows us to reject whatever is from man; for this is the only distinction that he lays down, by which we ought to distinguish between doctrines.

Footnotes

1 - "Entre la faussete et la verite."

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.

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,.... Meaning, not one that perfectly fulfils the law, which is the good, and perfect, and acceptable will of God; for there is no man that does this, or can do it; nor is it so said here, "if any man do his will", but "if any man will do" it; that is, is desirous of doing it; who has it wrought in him both to will and do, of the good pleasure of God, by his grace and Spirit; with whom to will is present, though, he has not power to perform, and so is a spiritual man; and who believes in the Lord Jesus Christ, which is one branch of the will of God; and who depends upon the Spirit and grace of God, and acts from a principle of love to God, and in the exercise of faith on Christ:
he shall know of the doctrine, whether it be of God, or whether I speak of myself; not a man of mere natural knowledge and learning, or a man of theory and speculation, is a judge of doctrine; but he that leans not to his own understanding, and implores the assistance of the Divine Spirit, and who is for reducing doctrine into practice: he knows by the efficacy of the doctrine upon his heart, and the influence it has on his life and conversation; by its coming not in word only, but in power; and by its working effectually in him, whether it is divine or human, of God or of man.

If any man will do his will, &c.--"is willing," or "wishes to do."
whether . . . of God, or . . . of myself--from above or from beneath; is divine or an imposture of Mine. A principle of immense importance, showing, on the one hand, that singleness of desire to please God is the grand inlet to light on all questions vitally affecting one's eternal interests, and on the other, that the want of his, whether perceived or not, is the chief cause of infidelity amidst the light of revealed religion.

If any man will do his will, he shall know of the doctrine. The Common Version is ambiguous. The Revision is clear: If any man willeth to do, etc. The difficulty is in the way of the Jews recognizing the teaching of Jesus as divine, was that they were not willing to do God's will. This spirit of disobedience is the source of most, if not all, skepticism. Unbelief is due, not to the head, but to the heart. He who in his heart says, "Thy will be done, give me light and I will walk in it," will find that Christ is just the teacher demanded by his soul, and that the gospel meets his soul's want. Jesus will so meet the wants of his soul that he will be satisfied and will know the doctrine, that it comes from him who made the soul. The great German poet, Heine, was a scoffer until old and tortured with chronic disease. Then he said: "I have discarded my proud philosophy and learned to trust in the consolations of religion." He had no more outward evidence than before, but his heart had changed.

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.