What does Psalm 48:11 mean?

This psalm holds up Jerusalem as an example of God's glory (Psalm 48:1–3). "Mount Zion" is a term used for a few different aspects of the site on which Jerusalem is built. As such, references to Zion or Mount Zion are bywords for the city of Jerusalem. The people of the city are poetically called "daughters of Judah." Jerusalem was in that tribe's territory, and the unending line of kings through David was part of Judah (2 Samuel 7:12–13).

God's "judgments" are reflected in His actions. This psalm may look back on events such as the miraculous failure of an attack during the reign of Jehoshaphat (2 Chronicles 20), or, perhaps on the annihilation of an Assyrian army attempting to lay siege to Jerusalem (2 Kings 19). These remarkable events were proof of God's direct intervention on behalf of His people and the city from which their king reigned.

In his letter to Titus, the apostle Paul describes the believer's hope of eternal life as having been promised by God. He underscores the certainty that this promise will be fulfilled because God cannot lie (Titus 1:2). Every promise God gave to Israel regarding His plans for her will be fulfilled, because He cannot lie (Hebrews 6:13–20). Also, every promise He has given to Christians will be fulfilled because He cannot lie. Paul writes in 2 Corinthians 1:20: "For all the promises of God find their Yes in [Jesus]. That is why it is through him that we utter our Amen to God for his glory."