Nicene · c. 335 – c. 395
St. Gregory of Nyssa
Cappadocia
Biography
Younger brother of St. Basil, Gregory of Nyssa was reluctantly made bishop of a minor see but grew into the most philosophically profound of the three Cappadocian Fathers, deeply shaped by Origen's mystical theology. He played a leading role at the Council of Constantinople in 381, which finalized the Nicene Creed's confession of the Holy Spirit. His writings on the spiritual life, especially the Life of Moses, became foundational for later Christian mysticism.
Historical background
Active in the final settlement of Trinitarian orthodoxy at Constantinople in 381, Gregory also wrote extensively defending prayer for the dead and purification after death, an important early witness to the doctrine that would later be called purgatory.
Major writings
Life of Moses
An allegorical spiritual classic on the ascent of the soul to God.
The Great Catechism
A systematic exposition of Christian doctrine for catechists.
On the Soul and the Resurrection
A dialogue on death, purification, and bodily resurrection.
Important teachings
Gregory teaches that souls not perfectly purified at death undergo a cleansing process before entering the fullness of glory, an early articulation of purgation after death. He also emphasizes the soul's endless dynamic growth (epektasis) into the infinite goodness of God.
Quotations
“When he has quitted his body and the difference between virtue and vice is known, he cannot approach God till the purging fire shall have cleansed the stains with which his soul was infested.”
“The bread... is at once changed into the body by means of the Word... transmuting the natural quality of these visible things to that immortal thing.”