Union with Christ

A great mystery in the way of sanctification is the glorious manner of our fellowship with Christ in receiving a holy frame of heart from Him. It is by our being in Christ, and having Christ Himself in us - and that not merely by His universal preference as He is God, but by such a close union as that we are one spirit and one flesh with Him; which is a privilege peculiar to those that are truly sanctified. I may well call this a mystical union, because the apostle calls it a great mystery, in an Epistle full of mysteries (Eph. 5:32 ), intimating that it is eminently great above many other mysteries. It is one of the three mystical unions that are the chief mysteries in religion. The other two are the union of the Trinity of Persons in one Godhead, and the union of the divine and human natures in one Person, Jesus Christ, God and man. Though we cannot frame an exact idea of the manner of any of these three unions in our imaginations, because the depth of these mysteries is beyond our comprehension, yet we have cause to believe them all, because they are clearly revealed in Scripture, and are a necessary foundation for other points of Christian doctrine. Particularly, this union between Christ and believers is plain in several places of Scripture, affirming that Christ is, and dwells in believers, and they in Him (John 6:56; 14:20); and that they are so joined together as to become one Spirit (1 Cor. 6:17); and that believers are 'members of His body, of His flesh and of His bones' and they two, Christ and the church, are one flesh (Eph. 5:30, 31).

Furthermore, this union is illustrated in Scripture by various resemblances, which would be very much unlike the things which they are made use of to resemble, and would rather seem to beguile us by obscuring the truth than instruct us by illustrating it, if there were no true proper union between Christ and believers. It is resembled by the union between God the Father and Christ (John 14:20; 17:21 -23); between the vine and its branches (John 15:4, 5); between the head and body (Eph. 1:22, 23); between bread and the eater (John 6:51, 53, 54). . Though Christ is in heaven, and we on earth, yet He can join our souls and bodies to His at such a distance without any substantial change of either, by the same infinite Spirit dwelling in Him and us; and so our flesh will become His, when it is quickened by His Spirit; and His flesh ours, as truly as if we ate His flesh and drank His blood. And He will be in us Himself by His Spirit, who is one with Him, and who can unite more closely to Christ than any material substance can do, or who can make a more close and intimate union between Christ and us. And it will not follow from this that a believer is one person with Christ, any more than that Christ is one person with the Father, by that great mystical union. Neither will a believer be in this way made God, but only the temple of God, as Christ's body and soul is; and the Spirit's lively instrument, rather than the principal cause. Neither will a believer be necessarily perfect in holiness in this way, or Christ made a sinner. For Christ knows how to dwell in believers by certain measures and degrees, and to make them holy so far only as He dwells in them. And though this union seem too high a preferment for such unworthy creatures as we are, yet, considering the preciousness of the blood of God, by which we are redeemed, we should dishonour God, if we should not expect a miraculous advancement to the highest dignity that creatures are capable of through the merits of that blood. Neither is there anything in this union contrary to the judgement of sense, because the bond of the union, being spiritual, does not fall at all under the judgement of sense.