When the intellect practices the virtues correctly, it advances in moral understanding. When it practices contemplation, it advances in spiritual knowledge… Finally, the intellect is granted the grace of theology when, carried on wings of love beyond these two former stages, it is taken up into God and with the help of the Holy Spirit discerns—as far as this is possible for the human intellect—the qualities of God.
If you are about to enter the realm of theology, do not seek to descry God’s inmost nature, for neither the human intellect nor that of any other being under God can experience this; but try to discern, as far as possible, the qualities that appertain to His nature—qualities of eternity, infinity, indeterminateness, goodness, wisdom, and the power of creating, preserving and judging creatures, and so on. For he who discovers these qualities, to however small an extent, is a great theologian.
— Maximus the Confessor, Four Centuries on Love 2.25-26, in The Philokalia, vol. 2, 69.