Thomas Manton in his sermon on Psalm 119:129 (Sermon CXLI) lists the wonders which one should see in being reconciled to God in Jesus Christ.

First, to be called at all:

1 Peter 2:9, ‘He hath called us out of darkness into his marvellous light.’

There is no man converted by the word of God but hath cause to wonder at his own estate, at the condescension of God in plucking him as a brand out of the burning, or that woful condition wherein he was before, when others are left to perish: John 14:22, ‘Lord, how is it that thou wilt manifest thyself to us, and not unto the world?’

Second, the privilege of reconciliation and communion with God:

And then that we are brought into the possession of such excellent privileges as we enjoy in our new estate, peace that passeth all understanding, Phil. 4:7, joy unspeakable and full of glory, 1 Peter 1:8; privileges greater than can be imagined or expressed. So are their hearts ravished in the sense of their reconciliation with God and communion with him.

Third, everlasting blessings promised:

So also in giving them such an undoubted right to an everlasting blessed estate in the heavens: 1 Cor. 2:9, ‘Eye hath not seen, nor ear heard, neither have entered into the heart of man, the things which God hath prepared for them that love him.’

He hath promised them a happiness which they can never think of, but every day they must fall a-wondering anew; and all this wrought by an exceeding great power working together with the word, Eph. 1:19;

Manton compares the wonder of the man rescued by God to the rescue of Peter by the angel. Peter had been imprisoned by Herod and was awaiting death. During the evening, an angel appeared in the prison, rescued Peter, and delivered him free of his chains:

as Peter wondered at his own deliverance, when chains and gates and bars did all give way to the power of the angel that brought him forth: Acts 12:9–11, ‘And he went out, and followed him, and wist not that it was true that was done by the angel, but thought he saw a vision. When they were past the first and the second ward, they came unto the iron gate that leadeth into the city, which opened to them of its own accord, and they went out and passed on through one street, and forthwith the angel departed from him. And when Peter was come to himself, he said, Now I know of a surety that the Lord hath sent his angel, and hath delivered me out of the hand of Herod, and from all the expectation of the people of the Jews.’

So may every one that is converted to God stand wondering, when he considereth how, from whence, and to what he is called by God; all this is wonderful indeed.

This image reminds one of Charles Wesley’s verse in the hymn, “And Can it Be?”

Long my imprisoned spirit lay,
Fast bound in sin and nature’s night;
Thine eye diffused a quickening ray—
I woke, the dungeon flamed with light;
My chains fell off, my heart was free,
I rose, went forth, and followed Thee.
My chains fell off, my heart was free,
I rose, went forth, and followed Thee.

Fourth, there is the wonder of the change wrought within u:

There is more of God seen in inward experiences than in outward; in converting, comforting, quickening, and carrying on the work of grace in our own hearts, than in governing the courses of nature; therefore the apostle appealeth to this internal power, Eph. 3:20, ‘Unto him that is able to do exceeding abundantly above all that we ask or think, according to the power that worketh in us.’

He instanceth in that which God hath done for us in Christ, which is beyond our prayer, conceptions, and hopes; transcending the hopes and apprehensions of the most enlarged hearts. Thus is a Christian a wonder to himself.

Thomas Manton, The Complete Works of Thomas Manton, vol. 8 (London: James Nisbet & Co., 1872), 333–334.