In all religions prayer has a part in people's lives. Consider how devout Muslims bow three times each day toward Mecca and pray. Jews in Jerusalem visit the "wailing wall" and wail prayers. Prayer plays a central role in the lives of Christians. Indeed, Ursinus, the main author of the Heidelberg Catechism, says in Q116 that prayer is necessary for a Christian and that "it is the chief part of thankfulness that God requires of us." Then Bible verses are cited to back up that claim.