Adam Clarke on Psalms 51:13

Then will I teach transgressors - I will show myself to be grateful; I will testify of thy loving-kindness; I will call on transgressors to consider the error of their ways; and shall set before them so forcibly thy justice and mercy, that sinners shall be converted unto thee. With a little change I can adopt the language of Dr. Delaney on this place: "Who can confide in his own strength, when he sees David fall? Who can despair of Divine mercy when he sees him forgiven? Sad triumph of sin over all that is great or excellent in man! Glorious triumph of grace over all that is shameful and dreadful in sin!"