What does it mean that the believer's heart is fixed on the Lord?

The phrase 'fixed on the Lord' describes a heart that is firm, stable, and secure, capable of remaining steadfast amid the trials of life. Such a heart rests fully on God's promises and character. Psalm 112:7 illustrates that the righteous man is unafraid of calamities because his trust is anchored in the Lord. This fixation on God is not based on emotion but is a deliberate choice to rely on Him. It reflects a deep-seated faith that acknowledges God's sovereignty and His providential care over every circumstance in the believer's life, making the heart unshakable in times of distress.