CCC 252
Profession of Faith›SECTION TWO I. THE CREEDS›CHAPTER ONE I BELIEVE IN GOD THE FATHER›Paragraph 2. THE FATHER
The Church uses (I) the term "substance" (rendered also at times by "essence" or "nature") to designate the divine being in its unity, (II) the term "person" or "hypostasis" to designate the Father, Son and Holy Spirit in the real distinction among them, and (III) the term "relation" to designate the fact that their distinction lies in the relationship of each to the others. The dogma of the Holy Trinity