Albert Barnes Commentary Psalms 147:11

"Jehovah taketh pleasure in them that fear him, In those that hope in his lovingkindness." — Psalms 147:11 (ASV)

The Lord taketh pleasure in them that fear him—In those who truly worship him, however humble, poor, and unknown to people they may be; however unostentatious, retired, unnoticed may be their worship. Not in the “pride, pomp, and circumstance of war” is his pleasure; not in the march of armies; not in the valor of the battlefield; not in scenes where “the garments of the warrior are rolled in blood,” but in the closet, when the devout child of God prays; in the family, when the group bend before Him in solemn devotion; in the assembly—quiet, serious, calm—when his friends are gathered together for prayer and praise; in the heart that truly loves, reverences, adores Him.

In those that hope in his mercy—It is a pleasure to him to have the guilty, the feeble, the undeserving hope in Him—trust in Him—seek Him.