The Duties of the Heart, by Rabbi Bachye, tr. by Edwin Collins, , at sacred-texts.com
While some religious and moral duties are only obligatory at special times and in special circumstances, these duties of the heart, taught by Reason, Scripture, or Tradition, are incumbent upon us continually, all the days of our life and at every moment. As the Psalmist says:—(Ps. cxix.) "Trust in the Eternal at all times." Nor, for instance, can there be a moment of our lives when it is not incumbent upon
us to remove hatred and jealousy from our hearts.