WSC Q.32: What benefits do they that are effectually called partake of in this life?
They that are effectually called do in this life partake of justification, (Rom. 8:30) adoption, (Eph. 1:5) and sanctification, and the several benefits which in this life do either accompany or flow from them. (1 Cor. 1:26,30)
WLC Q.69: What is the communion in grace which the members of the invisible church have with 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, (Rom. 8:30) adoption, (Eph. 1:5) sanctification, and whatever else, in this life, manifests their union with him. (1 Cor. 1:30)
WCF 26.1.
All saints, that are united to Jesus Christ their Head, by His Spirit, and by faith, have fellowship with Him in His grace, sufferings, death, resurrection, and glory: (1 John 1:3, Eph. 3:16–19, John 1:16, Eph. 2:5–6, Phil. 3:10, Rom. 6:5–6, 2 Tim. 2:12) and, being united to one another in love, they have communion in each other’s gifts and graces, (Eph. 4:15–16, 1 Cor. 12:7, 1 Cor. 3:21–23, Col. 2:19) and are obliged to the performance of such duties, public and private, as do conduce to their mutual good, both in the inward and outward man. (1 Thess. 5:11,14, Rom. 1:11–12,14, 1 John 3:16–18, Gal. 6:10)