Charles H. Spurgeon on Psalms 111:9

Sent redemption...commanded his covenant. The deliverance was the more thankworthy, as being upon a covenant account: for thus every mercy is a token of the Lord's favour to his favourite: it is this which makes common mercies to become special mercies. Carnal men, so that they enjoy mercies, they mind not which way they come in, so as they can but have them; but a child of God knows that everything that comes through the Redeemer's hands and by his covenant is the better for it, and tastes the sweeter by far. —William Cooper, in the Morning Exercises.

Verse 10 (first clause). In this passage fear is not to be understood as referring to the first or elementary principles of piety, as in 1Jo 4:18, but is comprehensive of all true godliness, or the worship of God. —John Calvin.