Lesson 1 Mary, Mother of God Mary is the mother of God and we celebrate this solemnity on January 1st. Catechism Connections Lesson Topics Mother of God Marian Feasts Jesus Elizabeth Ann Seton Essential Lessons Lesson Vocabulary Incarnation: The Incarnation is the fact that the Second Person of the Holy Trinity, the Son of God, assumed a human nature in the Person of Jesus Christ. Solemnity