John Trapp on Psalms 21:6

Verſ. 6. For thou haſt made him moſt bleſſed for ever] Heb. Thou haſt ſet him to be bleſſings. For as the wicked, when deſtroyed by ſome horrible Judgment, are examples to others of Gods curſe, Iſa. 65.15. Jer. 29.22. 2 Pet. 2.6. Judaeus ſim, ſi fallam, ſay the Turks at this day, when they would aſſure any thing for a certainty; ſo the godly when in a ſpeciall manner bleſſed, are Patterns of bleſſings to others, that in them they may bleſſe themſelves or others, Pſal. 72.17. Pſal. 1▪28. 4. Gen. 12.2. & 48.20. Ruth 4.11, 12. See Pſal. 37.26. So here they ſhall ſay, Tanto rerum ſucceſſu polleas, quanto David, Maiſt thou bee as ſucceſsfull as ever David was.

Thou haſt made him exceeding glad with thy countenance] One good caſt whereof David long ſince preferred before all the worlds good, Pſal. 4.6. See the Note there.