A31: Effectual calling is the work of God’s Spirit₁, whereby convincing us of our sin and misery₂, enlightening our minds in the knowledge of Christ₃, and renewing our wills₄, he doth persuade and enable us to embrace Jesus Christ, freely offered to us in the gospel₅.

1. 2 Timothy 1:9; 2 Thess 2:13-14
2. Acts 2:37
3. Acts 26:18
4. Ezekiel 36:26-27
5. John 6:44-45; Phil 2:12

For further study see:

1. WSC 30: How doth the Spirit apply to us the redemption purchased by Christ?
2. WLC 67: What is effectual calling?
3. WCF CHAPTER 10: Of Effectual Calling
4. Dr. Dennis Prutow explains WSC 31 (part 1):
   
5. Dr. Dennis Prutow explains WSC 31 (part 2: ‘Common Operations of the Spirit’)
   
6. Another way to describe “effectual calling” is “irresistible grace” Dr. R.C. Sproul explains in this video: