Man’s original capacities included both the power not to sin and the power to sin. In Adam’s original sin, man lost the power not to sin and retained the power to sin — which he continues to exercise. In the fulfillment of grace, man will have the power to sin taken away and receive the highest of all, the power not to be able to sin.

Augustine
On Correction and Grace

Idolatry is our most basic sin, and in it an exchange is made: God reveals his truth about Himself, and we trade in that truth and walk out with a lie.

R.C. Sproul
Tabletalk (Ligonier Ministries, March 2014)

A fire was suddenly kindled in my soul. I fell in love with the prophets and these men who had loved Christ; I reflected on all their words and found that this philosophy alone was true and profitable.

Oh, we poor men that we should be so cold and indifferent to this great joy which has been given us. This indeed is the greatest gift, which far exceeds all else that God has created. And we believe so feebly even though the angels proclaim and preach and sing, and their song is fair and sums up the whole of Christian religion, for ‘glory to God in the highest’ is the very heart of worship. This they wish for us and bring to us in Christ.

Martin Luther
Christmas Eve 1538

When God is about to justify a man, he damns him. Whom he would make alive he must first kill. God’s favor is so communicated in the form of wrath that it seems farthest when it is at hand.