'Wisdom and spiritual knowledge are both gifts of the one Holy Spirit, as are all the divine gifts of grace; but each has its own distinctive energy. For this reason the Apostle testifies that to one is given wisdom, to another spiritual knowledge by the same Spirit (cf. 1 Cor. 12:8). Such knowledge unites man to God through experience, but does not move him to express outwardly what he knows. Some, then, of those who practice the solitary life are consciously illuminated by spiritual knowledge, yet do not speak about God. But when wisdom, with the fear of God, is given to someone at the same time as spiritual knowledge - and this seldom happens - it leads him to express outwardly the inner energies of this knowledge within him; for spiritual knowledge illuminates men through its inner energy while wisdom does so through being expressed outwardly. Spiritual knowledge comes through prayer, deep stillness and complete detachment, while wisdom comes through humble meditation on Holy Scripture and, above all, through grace given by God.'