Fasting, similar to other actions in life, has specific purposes and appointed times. The Bible offers various reasons why people might fast: an immediate need in prayer (2 Samuel 12:16), a need to loosen the bands of wickedness or undo heavy burdens (Isaiah 58:6), during times of elevated conflict or duty in service (Matthew 17:21; Acts 13:3), as a symbol of mourning (2 Samuel 1:12), and as an outward manifestation of true repentance (Jonah 3:5). This list is not exhaustive, but simply demonstrates that God’s people have many good reasons for fasting. Even if none of these circumstances surfaces in our lives, we should fast because we know that the Lord expects us to do so.
Psalm 51 describes some of the dire consequences resulting from David’s sin with Bathsheba (see 2 Samuel chapters 11-12). Our passage commences with David’s testifying about his desire to be washed (Psalm 51:7). The next verse speaks of his desire to hear joy and gladness. David then goes on to express his desire for a clean heart and a right spirit. David was experiencing the debilitating results of his sin. Sin diminishes the spiritual blessings that God intends. In addition to these lost blessings, David also lost his joy. Joy is offered to the people of God, but never unconditionally. The conditions necessary for fulness of joy were discussed in the previous lesson, but it should be noted that the opposite actions yield contrary outcomes.
