Albert Barnes Commentary Psalms 72:19

"And blessed be his glorious name for ever; And let the whole earth be filled with his glory. Amen, and Amen." — Psalms 72:19 (ASV)

And blessed be his glorious name forever — The name by which He is known—referring perhaps particularly to His name "Yahweh." Still, the prayer would be that all the names by which He is known, all by which He has revealed Himself, might be regarded with veneration always and everywhere.

And let the whole earth be filled with his glory — With the knowledge of Himself, with the manifestations of His presence, and with the influences of His religion .

This prayer was especially appropriate at the close of a psalm designed to celebrate the glorious reign of the Messiah. Under that reign, the earth will be, in fact, filled with the glory of God; the world will be a world of glory.

Assuredly, all who love God and who love humankind, all who desire that God may be honored and that the world may be blessed and happy, will unite in this fervent prayer and re-echo the hearty "Amen and amen" of the psalmist.

Amen, and amen — So be it. Let this occur. Let this time come. The expression is doubled to denote intensity of feeling. It is the outpouring of a heart full of desire that this might be so.