Gregory of Nyssa was one of the great "fathers" of the Church. He lived in the fourth century, a time when the persecution of the Christians was coming to an end. Gregory was one of three Greek Cappadocian fathers (the other two were Gregory's brother, St. Basil, and their mutual friend, Gregory of Nazianzus).
He was called "one of the most powerful and most original thinkers ever known in the history of the Church" (Louis Bouyer). His writings have had a great influence on the spirituality of the Eastern church. He was well versed in Greek philosophy, notably Platonism and Stoicism, but the basis of his thought was rooted in the Bible.
Gregory believed that the main use of the Bible was not for historical reflection but rather for growth in virtue. He and the other Church fathers used the Bible and its characters to teach us how to grow closer to God, how to "elevate" the soul to God. He saw the spiritual life as a race in which we, like St. Paul, "forget...what lies behind and strain...forward to what lies ahead" (Philippians 3:13). For Gregory, perfection is discovered in continual striving—a perpetual progress rooted in the infinite grace of God.