How do we know that worship must be wholehearted?

The necessity of wholehearted worship is grounded in the understanding that God does not accept insincere offerings. As stated in Psalm 138, David expresses a desire to worship the Lord with his whole heart. This indicates that true worship must be genuine and stem from a heart transformed by God. In terms of theology, TULIP teaches that believers can only desire and engage in true worship because God has changed their hearts, making them willing to submit to Him completely. Thus, anything less than total devotion would be devoid of the sincerity that God desires, rendering such worship null and void.