9. …….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.
10. Our intellect often finds it hard to endure praying because of the straightness and concentration which this involves; but it joyfully turns to theology because of the broad and unhampered scope of divine speculation. Therefore, so as to keep the intellect from expressing itself too much in words or exalting itself unduly in its joy, we should spend most of our time in prayer, in singing psalms and reading the Holy Scriptures, yet without neglecting the speculations of wise men whose faith has been revealed in their writings.
St Diadochos of Photiki, On Spiritual Knowledge and Discrimination, Philokalia V1.255