How do we know that grace is necessary for spiritual thirst?

The sermon illustrates that spiritual thirst cannot be manufactured by human effort; it is a gift from God. Just as David expressed his need for water in 2 Samuel 23:15, believers feel a profound need for the grace and mercy of God, which fosters a genuine thirst for spiritual sustenance. Grace is the means by which God regenerates hearts, enabling individuals to seek Him authentically. Thus, understanding spiritual thirst leads to recognizing that it is only through grace that we can desire and have a relationship with God, emphasizing our dependence on His initiative in our lives.