Lord’s Day 13, Chapter 2: Christ’s Sonship and Ours

To avoid repetition, we must clearly distinguish just what subject the Heidelberg Catechism is discussing in the thirteenth Lord's Day. We must not, in this connection, speak of the mystery of the incarnation as such, the doctrine that the Son of God assumed our flesh and blood from the virgin Mary. For this is treated in the following Lord's Day. Nor is it the purpose of this part of the Catechism to discuss the mystery of the sonship of the second Person in the Holy Trinity, for this was...