That man is not in Christ who is an utter stranger to his person, natures, offices, and the design of his coming into the world; together with the spiritual benefits purchased by his death. Neither is he in Christ, who never saw his need of him, or that there is no hope of salvation without him. Again, he is not in Christ, who obstinately refuses to submit to his government, lives in a wilful contempt of his laws, resolutely persists in the commission of known sins, or in the total neglect of known duties. Again, he is not in Christ, who is ashamed of his doctrine, his gospel, his cross, which a true believer counts his glory; as the apostle says, _God forbid that I should glory, save in the cross of Jesus Christ_, Gal. vi. 14. He must also be reckoned out of Christ, who is stupid and presumptuous; and, though, probably, he may hope to be saved by him, yet desires not to have communion with him, but expects to be made partaker of his benefits without faith; or if he pretends to have faith, it is only an assent to some truths, without being accompanied with repentance, and other graces which are inseparably connected with that faith which is saving. But, on the other hand, we may know that we are in Christ, if we can truly say, (1.) That we have received a new nature from him, from whence proceed renewed actions, which discover themselves in the whole course of our lives; _If any man be in Christ, he is a new creature: Old things are passed away, behold, all things are become new_, 2 Cor. v. 17. (2.) We must enquire, whether we endeavour constantly to adhere to his revealed will, not barely as the result of some sudden conviction; but as making it the main business of life, to approve ourselves to him in well doing, as our Saviour says, _If ye continue in my word, then ye are my disciples indeed_, John viii. 31. (3.) Converse with Christ in ordinance, is another evidence of our being in him: For, as a man is said to be known by the company he keeps, or delights to be in; so a true Christian is known, as the apostle says, by his _having fellowship with the Father, and with his son Jesus Christ_, 1 John i. 3. (4.) We must enquire, whether we have a great concern for the glory and interest in our own souls, and an earnest desire that his name may be known and magnified in the world; and this accompanied with our using the utmost endeavours in our various stations and capacities in order thereunto?