For God, who said, “Let light shine out of darkness,” has shone in our hearts to give the light of the knowledge of the glory of God in the face of Jesus Christ. (2 Corinthians 4:6)
Faith implies the enlightening of the understanding to discover the suitableness of Jesus Christ as a Saviour, and the excellency of the way of salvation through him. While the sinner lies undone and helpless in himself, and looking about in vain for some relief, it pleases a gracious God to shine into his heart, and enables him to see his glory in the face of Jesus Christ.
Now this once neglected Saviour appears not only absolutely ncessary, but also all-glorious and lovely, and the sinner’s heart is wrapt away, and for ever captivated with his beauty: now the neglected gospel appears in a new light, as different from all his former apprehensions as if it were quite another thing.
— Samuel Davies, Sermons of the Rev. Samuel Davies, Vol 1 (Pittsburgh, PA: Soli Deo Gloria Publications, 1993), 125
(HT: Of First Importance)