Albert Barnes Commentary Psalms 128:6

"Yea, see thou thy children`s children. Peace be upon Israel." — Psalms 128:6 (ASV)

Yea, thou shalt see thy children’s children—This is a continuation of the idea of blessedness as connected with a numerous posterity—an object of so much interest to the Hebrews (see the notes at Psalms 128:3), and having its foundation in our nature.

And peace upon Israel—See Psalms 125:5. This is the crowning blessing; a blessing above that of success in worldly affairs, and above that of seeing a numerous and happy posterity. The love of God is the supreme affection in the mind of a pious man; the desire that His cause may prosper and triumph is to him a supreme desire. Humankind is truly and completely blessed only in religion.