What does the Bible say about the heart in prayer?

In Psalm 119, the psalmist expresses that worship and prayer must engage the heart fully, stating, 'With my whole heart, I pray.' The heart is seen as the source of true worship, from which all genuine faith and prayer emerge. Solomon's instruction to 'give me thine heart' points to the importance of a heart committed to knowing God. Without a heart devoted to Him, worship becomes mere formality. This concept emphasizes that true prayer and worship are fundamentally internal experiences that reflect our deep affection and understanding of God.