... this single faculty of perception is split because of the dislocation which, as a result of Adam's disobedience, takes place in the intellect through the modes in which the soul now operates. Thus 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 practise self-restraint, the intellect longs to pursue heavenly beauty. 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.
("Philokalia (Vol. 1)", p. 261, text 29)
... Everything longs for what is akin to itself: the soul, since it is bodiless, desires heavenly goods, while the body, being dust, seeks earthly nourishment. So we shall surely come to experience immaterial perception if by our labours we refine our material nature.
("Philokalia (Vol. 1)", p. 259, text 24)