Augustine of Hippo

"Great is the Lord, and greatly to be praised" [Psalm 48:1]....That is, "in the city of our God, in His holy mountain." This is the city set upon an hill, which cannot be hid: this is the candle which is not hidden under a bushel, [Matthew 5:14-15] to all known, to all proclaimed. …

Exposition on Psalm 48 ↗

Ambrose of Milan

He is everywhere great and powerful, but our narrow mind cannot take in the greatness of his divine power and grace. The closer our knowledge gets to God, the more wonderful his majesty appears to be.

Commentaries on the Twelve Davidic Psalms, On Psalm 48 ↗

Thomas Aquinas

Above, the Psalmist invited the nations to sing praise to God for the benefits of God; here, however, he describes the great exultation of the people or of the city. The title: "A Psalm, a song of praise of the sons of Korah, for the second day of the sabbath." Among the Jews, the sabbath was held as the most solemn day, and they named all the weekdays from the sabbath, so that Sunday was called the first of the sabbath, Monday was called the second of the sabbath, and so on for the other days. …

Exposition on the Psalms of David ↗