Charles H. Spurgeon on Psalms 40:2

1. The depth of God's goodness to his people. It finds them often in a horrible pit and miry clay. There is a certain spider which forms a pit in sand, and lies concealed at the bottom, in order to seize upon other insects that fall into it. Thus David's enemies tried to bring him into a pit.

2. The height of his goodness. He brought me out and set my feet upon a rock. That rock is Christ. Those feet are faith and hope.

3. The breadth of his goodness establisheth my goings, restored me to my former place in his love, showing me still to have been his during my low estate. He was the same to me, though I felt not the same to him. My goings refer both to the past and the future.

4. The strength of his goodness established my goings, making me stand firmer after every fall.  —George Rogers.

Verses 2-3. The sinner's position by nature, and his rescue by grace.

Verses 2-3. By one and the same act the Lord works our salvation, our enemies' confusion, and the church's edification. J. P. Lange's Commentary.