What does the Bible say about the heart being fixed on God?

In Psalm 108, David expresses a heart that is fixed on praising God, emphasizing the importance of having a steadfast heart. This fixed heart, given by God, is one that is responsive to His will and recognizes the need for repentance and worship. Proverbs 4:23 instructs us to keep our hearts with all diligence, for out of them flow the issues of life. A heart that is fixed on God is essential for navigating the trials of life and remaining faithful in our worship, as seen in David’s commitment to praise God even amid struggles.