Albert Barnes Commentary Psalms 69:32

"The meek have seen it, and are glad: Ye that seek after God, let your heart live." — Psalms 69:32 (ASV)

The humble shall see this, and be glad — Margin, “The meek.” This means that others who are afflicted in this way—the poor, the needy, the oppressed, the sad—will learn about what has been done on my behalf, and will take courage, or be strengthened. They will learn to trust that God will also intervene in their troubles, and bring them out of their distresses.

And your heart shall live that seek God — Your heart will be revived; it will be encouraged, strengthened, and animated.