Psalms 101:1

David here cuts out to himself and others a pattern both of a good magistrate and a good master of a family; and, if these were careful to discharge the duty of their place, it would contribute very much to a universal reformation. Observe, I. The chosen subject of the psalm (Psa 101:1): I will sing of mercy and judgment, that is, 1. Of God's mercy and judgment, and then it looks back upon the dispensations of Providence concerning David since he was first anointed to be king, during which time he had met with many a rebuke and much hardship on the one hand, and yet, on the other hand, had had many wonderful deliverances wrought for him and favours bestowed upon him; of these he will sing unto God. Note, (1.) God's providences concerning his people are commonly mixed - mercy and judgment; God has set the one over-against the other, and appointed them April-days, showers and sunshine. It was so with David and his family; when there was mercy in the return of the ark there was judgment in the death of Uzza. (2.) When God in his providence exercises us with a mixture of mercy and judgment it is our duty to sing, and sing unto him, both of the one and of the other; we must be suitably affected with both, and make suitable acknowledgments to God for both.

— Matthew Henry's Concise Commentary (public domain)