Verse 2. And be not conformed, etc. The word rendered conformed properly means, to put on the form, fashion, or appearance of another. It may refer to anything pertaining to the habit, manner, dress, style of living, etc., of others.

To this world. (tw aiwni toutw). The word which is commonly rendered world, when applied to the material universe, is (kosmov), cosmos. The word used here properly denotes an age, or generation of men. It may denote a particular generation, or it may be applied to the race. It is sometimes used in each of these senses. Thus here it may mean, that Christians should not conform to the maxims, habits, feelings, etc., of a wicked, luxurious, and idolatrous age, but should be conformed solely to the precepts and laws of the gospel; or the same principle may be extended to every age, and the direction may be, that Christians should not conform to the prevailing habits, style, and manners of the world -- the people who know not God. They are to be governed by the laws of the Bible; to fashion their lives after the example of Christ; and to form themselves by principles different from those which prevail in the world. In the application of this rule there is much difficulty. Many may think that they are not conformed to the world, while they can easily perceive that their neighbour is. They indulge in many things which others may think to be conformity to the world, and are opposed to many things which others think innocent. The design of this passage is doubtless to produce a spirit that should not find pleasure in the pomp and vanity of the world; and which will regard all vain amusements and gaieties with disgust, and lead the mind to find pleasure in better things.

Be ye transformed. The word from which the expression here is derived means form, habit, (morfh). The direction is, "put on another form, change the form of the world for that of Christianity." This word would properly refer to the external appearance, but the expression which the apostle immediately uses, "renewing of the mind," shows that he did not intend to use it with reference to that only, but to the change of the whole man. The meaning is, do not cherish a spirit devoid to the world, following its vain fashions and pleasures, but cultivate a spirit attached to God, and his kingdom and cause.

By the renewing. By the making new; the changing into new views and feelings. The Christian is often represented as a new creature, 2 Co 5:17; Ga 6:15; Eph 4:24; 1 Pe 2:2.

Your mind. The word translated mind properly denotes intellect, as distinguished from the will and affections. But here it seems to be used as applicable to the whole spirit as distinguished from the body, including the understanding, will, and affections. As if he had said, let not this change appertain to the body only, but to the soul. Let it not be a mere external conformity, but let it have its seat in the spirit. All external changes, if the mind was not changed, would be useless, or would be hypocrisy. Christianity seeks to reign in the soul; and having its seat there, the external conduct and habits will be regulated accordingly.

That ye may prove. The word used here (dokimazein) is commonly applied to metals, to the operation of testing, or trying them by the severity of fire, etc. Hence it also means to explore, investigate, ascertain. This is its meaning here. The sense is, that such a renewed mind is essential to a successful inquiry after the will of God. Having a disposition to obey him, the mind will be prepared to understand his precepts. There will be a correspondence between the feelings of the heart and his will; a nice tact or taste, which will admit his laws, and see the propriety and beauty of his commands. A renewed heart is the best preparation for studying Christianity; as a man who is temperate is the best fitted to understand the ance; the man who is chaste has most clearly and forcibly the arguments for chastity, etc. A heart in love with the fashions and follies of the world is ill-fitted to appreciate the arguments for humility, prayer, etc. "If any man will do his will, he shall know of the doctrine whether it be of God," Joh 7:17. The reason why the heart is renewed is, that we may do the will of God; the heart that is renewed is best fitted to appreciate and understand his will.

That good, etc. This part of the verse might be rendered, that ye may investigate the will of God, or ascertain the will of God -- that which is good, and perfect, and acceptable. The will of God relates to his commands in regard to our conduct, his doctrines in regard to our belief, his providential dealings in relation to our external circumstances. It means what God demands of us, in whatever way it may be made known. They do not err from his ways who seek his guidance, and who, not confiding in their own wisdom, but in God, commit their way to him. "The meek will he guide in judgment, and the meek will he teach his way," Ps 25:9. The word good here is not an adjective agreeing with "will," but a noun. "That ye may find the will of God, that which is good and acceptable." It implies that that thing which is good is his will; or that we may find his will by finding that which is good and perfect. That is good which promotes the honour of God, and the interests of his universe.

Perfect. Free from defect, stain, or injury. That which has all its parts complete, or which is not disproportionate. Applied to religion, it means that which is consistent, which is carried out; which is evinced in all the circumstances and relations of life.

Acceptable. That which will be pleasing to God, or which he will approve. There is scarcely a more difficult text in the Bible than this, or one that is more full of meaning. It involves the main duty of religion to be separated from the world; and expresses the way in which that duty may be performed, and in which we may live so as to ascertain and do the will of God. If all Christians would obey this, religion would be everywhere honoured. If all would separate from the vices and follies, the amusements and gaieties of the world, Christ would be glorified. If all were truly renewed in their minds, they would lose their relish for such things; and seeking only to do the will of God, they would not be slow to find it.

{m} "be not conformed" 1 Jo 2:15