Effectual Calling

Original sin renders all human beings naturally dead (unresponsive) to God, but in effectual calling God quickens the dead.

Q. 31. What is effectual calling?
A. Effectual calling is the work of God's Spirit, whereby, convincing us of our sin and misery, enlightening our minds in the knowledge of Christ, and renewing our wills, he doth persuade and enable us to embrace Jesus Christ, freely offered to us in the gospel.

with scripture references:
Effectual calling is the work of God's Spirit,¹ whereby, convincing us of our sin and misery,² enlightening our minds in the knowledge of Christ,³ and renewing our wills,⁴ he doth persuade and enable us to embrace Jesus Christ, freely offered to us in the gospel.⁵

1. 2 Timothy 1:8-9. Be not thou therefore ashamed of the testimony of our Lord, nor of me his prisoner: but be thou partaker of the afflictions of the gospel according to the power of God; who hath saved us, and called us with an holy calling, not according to our works, but according to his own purpose and grace, which was given us in Christ Jesus before the world began.
   Ephesians 1:18-20. The eyes of your understanding being enlightened; that ye may know what is the hope of his calling, and what the riches of the glory of his inheritance in the saints, and what is the exceeding greatness of his power to us-ward who believe, according to the working of his mighty power, which he wrought in Christ, when he raised him from the dead, and set him at his own right hand in the heavenly places.
2. Acts 2:37. Now when they heard this, they were pricked in their heart, and said unto Peter and to the rest of the apostles, Men and brethren, what shall we do?
3. Acts 26:18. To open their eyes, and to turn them from darkness to light, and from the power of Satan unto God, that they may receive forgiveness of sins, and inheritance among them which are sanctified by faith that is in me.
4. Ezekiel 11:19. And I will give them one heart, and I will put a new spirit within you; and I will take the stony heart out of their flesh, and will give them an heart of flesh.
   Ezekiel 36:26-27. A new heart also will I give you, and a new spirit will I put within you: and I will take away the stony heart out of your flesh, and I will give you an heart of flesh. And I will put my spirit within you, and cause you to walk in my statutes, and ye shall keep my judgments, and do them.
5. John 6:44-45. No man can come to me, except the Father which hath sent me draw him: and I will raise him up at the last day. It is written in the prophets, And they shall be all taught of God. Every man therefore that hath heard, and hath learned of the Father, cometh unto me.
   Philippians 2:13. For it is God which worketh in you both to will and to do of his good pleasure.
   Deuteronomy 30:6. And the Lord thy God will circumcise thine heart, and the heart of thy seed, to love the Lord thy God with all thine heart, and with all thy soul, that thou mayest live.
   Ephesians 2:5. Even when we were dead in sins, hath quickened us together with Christ, (by grace ye are saved).

Illumination

ILLUMINATION
THE HOLY SPIRIT GIVES SPIRITUAL UNDERSTANDING
by J.I. Packer

The man without the Spirit does not accept the things that come from the Spirit of God, for they are foolishness to him, and he cannot understand them, because they are spiritually discerned. 1 CORINTHIANS 2:14

The knowledge of divine things to which Christians are called is more than a formal acquaintance with biblical words and Christian ideas. It is a realizing of the reality and relevance of those activities of the triune God to which Scripture testifies. Such awareness is natural to none, familiar with Christian ideas though they may be (like “the man without the Spirit” in 1 Cor. 2:14 who cannot receive what Christians tell him, or the blind leaders of the blind of whom Jesus speaks so caustically in Matt. 15:14, or like Paul himself before Christ met him on the Damascus road). Only the Holy Spirit, searcher of the deep things of God (1 Cor. 2:10), can bring about this realization in our sin-darkened minds and hearts. That is why it is called “spiritual understanding” (spiritual means “Spirit-given,” Col. 1:9; cf. Luke 24:25; 1 John 5:20). Those who, along with sound verbal instruction, “have an anointing from the Holy One... know the truth” (1 John 2:20).

The work of the Spirit in imparting this knowledge is called “illumination,” or enlightening. It is not a giving of new revelation, but a work within us that enables us to grasp and to love the revelation that is there before us in the biblical text as heard and read, and as explained by teachers and writers. Sin in our mental and moral system clouds our minds and wills so that we miss and resist the force of Scripture. God seems to us remote to the point of unreality, and in the face of God’s truth we are dull and apathetic. The Spirit, however, opens and unveils our minds and attunes our hearts so that we understand (Eph. 1:17-18; 3:18-19; 2 Cor. 3:14-16; 4:6). As by inspiration he provided Scripture truth for us, so now by illumination he interprets it to us. Illumination is thus the applying of God’s revealed truth to our hearts, so that we grasp as reality for ourselves what the sacred text sets forth.

Illumination, which is a lifelong ministry of the Holy Spirit to Christians, starts before conversion with a growing grasp of the truth about Jesus and a growing sense of being measured and exposed by it. Jesus said that the Spirit would “convict the world” of the sin of not believing in him, of the fact that he was in the right with God the Father (as his welcome back to heaven proved), and of the reality of judgment both here and hereafter (John 16:8-11). This threefold conviction is still God’s means of making sin repulsive and Christ adorable in the eyes of persons who previously loved sin and cared nothing for the divine Savior.

The way to benefit fully from the Spirit’s ministry of illumination is by serious Bible study, serious prayer, and serious response in obedience to whatever truths one has been shown already. This corresponds to Luther’s dictum that three things make a theologian: oratio (prayer), meditatio (thinking in God’s presence about the text), and tentatio (trial, the struggle for biblical fidelity in the face of pressure to disregard what Scripture says).

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From: Concise Theology: A Guide To Historic Christian Beliefs