John Calvin Commentary Psalms 86:9

"All nations whom thou hast made shall come and worship before thee, O Lord; And they shall glorify thy name." — Psalms 86:9 (ASV)

All nations which thou hast made shall come. If anyone would rather limit what is stated here to David’s present case, this view does not seem liable to any material objection. He, in fact, often enhances the Divine goodness he himself experienced with a similar magnificent style.

It may, however, be suitably extended to the universal power of God. Whether David speaks of the grace that was bestowed on him alone, or treats generally of God’s works, we must remember what has been observed elsewhere: whenever he celebrates the prevalence of true godliness among the Gentiles, he has in view the kingdom of Christ. Before Christ's coming, God gave only the initial or dawning manifestation of his glory, which eventually was diffused throughout the whole world by the preaching of the Gospel.

David was not ignorant of the future calling of the Gentiles. However, since this doctrine was unfamiliar to the Jewish people, they would have found it a disagreeable announcement to be told that the Gentiles should come to worship God without distinction alongside the children of Abraham and, with all distinction removed, share with them in heavenly truth.

To soften this announcement, David asserts that the Gentiles also were created by God. Therefore, it should not be considered strange if they, also being enlightened, should eventually acknowledge Him who had created and fashioned them.