Life-Giving Spirit (The Baptist Catechism, Section 12)

32 Q. How are we made partakers of the redemption purchased by Christ?
A. We are made partakers of the redemption purchased by Christ, by the effectual application of it to us (John 1:11,12) by his Holy Spirit (Titus 3:5,6).

33. Q. How doth the spirit apply to us the redemption purchased by Christ?
A. The Spirit applieth to us the redemption purchased by Christ, by working faith in us (Eph. 1:13, 14; John 6:37, 39; Eph. 2:8), and thereby uniting us to Christ, in our effectual calling (Eph. 3:17; 1 Cor. 1:9).