The invisible Church is the whole number of the elect, that have been, are, or shall be gathered into one under Christ the head.
The members of the invisible Church, by Christ, enjoy union and communion with him in grace and glory.
The union which the elect have with Christ is the work of God’s grace, whereby they are spiritually and mystically, yet really and inseparably, joined to Christ as their head and husband; which is done in their effectual calling.
Effectual calling is the work of God’s almighty power and grace, whereby (out of his free and special love to his elect, and from nothing in them moving him thereunto) he doth, in his accepted time, invite and draw them to Jesus Christ, by his Word and Spirit; savingly enlightening their minds, renewing and powerfully determining their wills, so as they (although in themselves dead in sin) are hereby made willing and able freely to answer his call, and to accept and embrace the grace offered and conveyed therein.
All the elect, and they only, are effectually called; although others may be, and often are, outwardly called by the ministry of the Word, and have some common operations of the Spirit; who, for their willful neglect and contempt of the grace offered to them, being justly left in their unbelief, do never truly come to Jesus Christ.
The communion in grace, which the members of the invisible Church have with Christ, is their partaking of the virtue of his mediation, in their justification, adoption, sanctification, and whatever else in this life manifests their union with him.
Justification is an act of God’s free grace unto sinners, in which he pardoneth all their sins, accepteth and accounteth their persons righteous in his sight; not for any thing wrought in them, or done by them, but only for the perfect obedience and full satisfaction of Christ, by God imputed to them, and received by faith alone.
Although Christ, by his obedience and death, did make a proper, real and full satisfaction to God’s justice in the behalf of them that are justified; yet in as much as God accepteth the satisfaction from a surety, which he might have demanded of them, and did provide this surety, his own only Son, imputing his righteousness to them, and requiring nothing of them for their justification but faith, which also is his gift, their justification is to them of free grace.
Justifying faith is a saving grace, wrought in the heart of a sinner, by the Spirit and Word of God, whereby he, being convinced of his sin and misery, and of the disability in himself and all other creatures to recover him out of his lost condition, not only assenteth to the truth of the promise of the gospel, but receiveth and resteth upon Christ and his righteousness therein held forth, for pardon of sin, and for the accepting and accounting of his person righteous in the sight of God for salvation.