In 2019, Bishop Wall issued a letter to his diocese mandating one of the Sunday Masses at the Cathedral of the Sacred Heart in Gallup be celebrated ad orientem. Wall said he would like to “encourage” parishes throughout the diocese to begin celebrating Mass ad orientem, which is “one of the most ancient and most consistent practices in the life of the Church.” Wall wrote that the “Mass is not first and foremost about us, but rather about God and His glory—about worshiping Him as He desires and not as we think best.”