WSC 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.

Ephesians 2
And you were dead in the trespasses and sins in which you once walked …

But God, being rich in mercy, because of the great love with which he loved us, even when we were dead in our trespasses, made us alive together with Christ—by grace you have been saved. And this is not your own doing; it is the gift of God.

HC Q. 27. What do you understand by the providence of God?
A. The almighty and ever-present power of God whereby he still upholds, as it were by his own hand, heaven and earth together with all creatures, and rules in such a way that leaves and grass, rain and drought, fruitful and unfruitful years, food and drink, health and sickness, riches and poverty, and everything else, come to us not by chance but by his fatherly hand.

HC Q.28. What advantage comes from acknowledging God's creation and providence?
A. We learn that we are to be patient in adversity, grateful in the midst of blessing, and to trust our faithful God and Father for the future, assured that no creature shall separate us from his love, since all creatures are so completely in his hand that without his will they cannot even move.