Matthew Henry Commentary Psalms 35:11-16

"Unrighteous witnesses rise up; They ask me of things that I know not. They reward me evil for good, [To] the bereaving of my soul. But as for me, when they were sick, my clothing was sackcloth: I afflicted my soul with fasting; And my prayer returned into mine own bosom. I behaved myself as though it had been my friend or my brother: I bowed down mourning, as one that bewaileth his mother. But in mine adversity they rejoiced, and gathered themselves together: The abjects gathered themselves together against me, and I knew [it] not; They did tear me, and ceased not: Like the profane mockers in feasts, They gnashed upon me with their teeth." — Psalms 35:11-16 (ASV)

Call a man ungrateful, and you can call him no worse: this was the character of David's enemies. In this, he was a type of Christ. David shows how tenderly he had behaved towards them in afflictions. We ought to mourn for the sins of those who do not mourn for themselves. We will not lose by the kind services we do for anyone, however ungrateful they may be. Let us learn to possess our souls in patience and meekness like David, or rather, after Christ's example.