Catechism › PART THREE: LIFE IN CHRIST › CHAPTER THREE GOD'S SALVATION: LAW AND GRACE › Article 3 THE CHURCH, MOTHER AND TEACHER › ¶ 2043 ¶ 2043 The fourth precept (“You shall keep holy the Holy Days Of Obligation.") completes the Sunday observance by Participation in the principal Liturgical feasts which honor the Mysteries of the Lord, the Virgin Mary, and the Saints. 85 Linked Concepts Liturgical Lord Mary Mysteries Participation Saints Virgin Holy Days Of Obligation Penance Fasting ← ¶ 2042 Browse ¶ 2044 →