17. he will rest in his love--content with it as His supreme delight (compare Lu 15:7, 10) [CALVIN], (Isa 62:5; 65:19). Or, He shall be silent, namely as to thy faults, not imputing them to thee [MAURER] (Ps 32:2; Eze 33:16). I prefer explaining it of that calm silent joy in the possession of the object of one's love, too great for words to express: just as God after the six days of creation rested with silent satisfaction in His work, for "behold it was very good" (Ge 1:31; 2:2). So the parallel clause by contrast expresses the joy, not kept silent as this, but uttered in "singing."

JFB.