John Calvin Commentary Psalms 102:15

"So the nations shall fear the name of Jehovah, And all the kings of the earth thy glory." — Psalms 102:15 (ASV)

And the nations shall fear the name of Jehovah. The prophet here describes the fruit that would result from the deliverance of the ancient tribes: namely, that God’s glory would thereby become illustrious among nations and kings. He subtly implies that when the Church is oppressed, the Divine glory is at the same time debased; just as the God of Israel was, no doubt, at the period referred to, derided by the ungodly, as if he had been lacking the power to help his people. It is therefore declared that if he redeems them, it will afford such a remarkable proof of his power as to compel the Gentiles to reverence him whom they despised.

The concluding part of the 16th verse, He has appeared in his glory, refers to the manifestation God made of himself when he brought out his Church from the darkness of death; just as it is said in another place concerning her first deliverance, Judah was his sanctuary, and Israel his dominions (Psalms 114:2). Similarly, in the present passage, by again gathering to himself his people who were dispersed, and by raising his Church, as it were, from death to life, he appeared in his glory. It is surely no ordinary consolation to know that the love of God towards us is so great, that he ensures his glory shines forth in our salvation. It is true that when the pious Jews were in the midst of their afflictions, the divine power at work was hidden from them. However, they always perceived it by the eye of faith and in the mirror of the divine promises.