In Liturgy, selection most frequently from one of the letters, or Epistles of the Apostles read at Mass after the Collects, at the (priest's) right-hand side of the altar and therefore called the Epistle side. It is also called Lesson. As a rule there is only one, but on some days in Lent, ember-days, there are several. At High Mass the Epistle is read aloud in one tone by the subdeacon.