How does Isaiah 26 illustrate God’s sovereignty in salvation?

In Isaiah 26:15, it states that 'Thou hast increased the nation, O Lord,' affirming that it is God who sovereignly builds His Church and gathers His elect. This idea is reinforced by the understanding that salvation is not through human will or effort but is a result of God's sovereign grace. It underlines the belief that God controls the unfolding of redemptive history and actively calls His people to Himself. Isaiah’s prophecies reveal that though trials may come, God’s purpose prevails in the salvation and preservation of His people, demonstrating His ultimate authority and power over salvation.