The greatness of God's mercy.

Charles Spurgeon comments on Psalm 57:10:

Psalm 57:10 For Your lovingkindness is great to the heavens And Your truth to the clouds.

It is not said merely that it is high as heaven, but great unto the heavens. It is high as the heavens, over-topping the greatest sin, and highest thought of man. It is wide as the far-reaching sky, compassing men of all ages, countries, classes, etc. It is deep. Everything of God is proportionate; this, therefore, is deep in abiding foundation, and infinite wisdom.

(Spurgeon, Treasury of David, 1/2:487).