The perceptive faculty natural to our soul is single, but it is split into two distinct modes of operation as a result of Adam's disobedience. - Diadochos of Photiki

If, therefore, we learn persistently to be detached from the good things of this world, we shall be able to unite the earthly appetite of the soul to its spiritual and intellectual aspiration, through the communion of the Holy Spirit who brings this about within us. For unless His divinity actively illumines the inner shrine of our heart, we shall not be able to taste God's goodness with the perceptive faculty undivided, that is, with unified aspiration.

One side of the soul is carried away by the passionate part in man, and we are then captivated by the good things of this life, but the other side of the soul frequently delights in the activity of the intellect and, as a result, when we practice self-restraint, the intellect longs to pursue heavenly beauty.

Timely silence, then, is precious, for it is nothing less than the mother of the wisest thoughts.