Early Catechetical Writings

The Didache, or the Teaching of the Twelve Apostles.
Justin Martyr. The First and Second Apologies.
Clement of Alexandria. The Instructor. The Stromata, or Miscellanies.
Tertullian. Homily on Baptism. Against Marcion. Apology. The Crown. To the Nations. Prescription Against Heresies. Repentance. The Resurrection of the Flesh.
Origen. Against Celsus. Principles. Homilies on Genesis and Exodus.
Constitutions of the Holy Apostles.
Cyril Of Jerusalem. Lenten Lectures. Mystagogical Lectures.
Augustine. The First Catechetical Instruction [De catechizandisrudibus]. On Faith and Works.