How do we know that God is a sovereign shepherd?

In the sermon, the preacher emphasizes two essential attributes of God as the sovereign shepherd: His self-existence and His eternality. The term 'Lord' signifies that He is sovereign, which means He is independent and self-governing. This can be seen in Psalm 24:1 where it states, 'The earth is the Lord's, and all its fullness.' Additionally, the eternal nature of God assures us that He does not change and remains our shepherd throughout time. This understanding of God's sovereignty provides comfort and assurance to believers, confirming that nothing can thwart His plans.