2 Samuel 19 - Matthew Henry's Concise Commentary on the Bible

Joab causes David to cease mourning.

To continue to lament for so bad a son as Absalom, was very unwise, and very unworthy. Joab censures David, but not with proper respect and deference to his sovereign. A plain case may be fairly pleaded with those above us, and they may be reproved for what they do amiss, but it must not be with rudeness and insolence. Yet David took the reproof and the counsel, prudently and mildly. Timely giving way, usually prevents the ill effects of mistaken measures.

(2Sa 19:9-15)