What does the Bible say about the joy of the Lord Jesus?

Psalm 21 emphasizes that the Lord Jesus Christ rejoices greatly in the strength of the Lord and in His salvation. As the King, He experiences immense joy because He has been given His heart's desire—namely, the salvation of His people. This joy is interwoven with the themes of divine blessing, where God's goodness precedes and sustains the King’s reign. In relationship to His people, Jesus' joy is complete because He delights in their salvation, further indicating the depth and value of the redemptive work He accomplished.