Joy, gratitude (or thankfulness), and trust are attitudes of faith. These are not optional, but are essential. By the exercise of these attitudes, they are strengthened within our lives and become attributes. By such exercise, faith is increased in our lives. The exercise of these attitudes also leads to deeper prayer, charity, and discipline, and other virtues of our faith. Psalm 15, according to the Septuagint accounting of the Psalms, Psalm 16 by the Masoretic accounting (common in western traditions), is an inspired declaration of joy, gratitude and trust.