Adam Clarke on Psalms 59:16

I will sing of thy power - For it was because thy hand was upon me for good, that I have thus succeeded in my enterprises.

Yea, I will sing aloud of thy mercy - I shall publish abroad what thou hast done; and done not for my worthiness, nor for the worthiness of the people; but for thy own mercy's sake.

In the day of my trouble - When I came with small means and feeble help, and had the force and fraud of many enemies to contend with, besides the corruption and unfaithfulness of my own people; thou wast then my defense; and in all attacks, whether open or covered, my sure refuge. I will, therefore, sing of thy mercy in the morning - I will hasten to acquit myself of a duty I owe to thee for such singular interpositions of mercy and power.