Theology without practice is the theology of demons

Those who, animal-like, live solely according to the senses... misuse God's creation in order to indulge the passions. They do not understand the principle of that wisdom which is revealed to all: that we should know and praise God through His creation and that by means of the visible world we should understand whence we came, what we are, for what purpose we were made and where we are going. On the contrary, they travel through this present age in darkness... with... ignorance of God.

Christianity is an entirely new way of being human.

When a man's intellect is constantly with God, his desire grows beyond all measure into an intense longing for God and his incensiveness is completely transformed into divine love. For by continual participation in the divine radiance his intellect becomes totally filled with light; and when it has reintegrated its passible aspect, it redirects this aspect towards God, filling it with an incomprehensible and intense longing for Him and with unceasing love, thus drawing it entirely away from worldly things to the divine.

When our intellect has shaken off its many opinions about created things, then the inner principle of truth appears clearly to it, providing it with a foundation of real knowledge and removing its former preconceptions as though removing scales from eyes, as happened in the case of St. Paul (cf. Acts 9:18). For an understanding of Scripture that does not go beyond the literal meaning, and a view of the sensible world that relies exclusively on sense perception, are indeed scales, blinding the soul's visionary faculty and preventing access to the pure Logos of truth.

The Logos came down out of love for us. Let us not keep Him down permanently, but let us go up with Him to the Father, leaving the earth and earthly things behind, lest He say to us what He said to the Jews because of their stubbornness: 'I go where you cannot come (Jn. 8:21).

He who through virtue and spiritual knowledge has brought his body into harmony with his soul has become a harp, a flute and a temple of God. He has become a harp by preserving the harmony of the virtues; a flute by receiving the inspiration of the Spirit through divine contemplation; and a temple by becoming a dwelling place of the Logos through the purity of his intellect.