10 Over the white and the green vestments, as the crown and perfection of this disguise and livery, the soul now puts on the third colour, which is a splendid garment of purple. By this is denoted the third virtue, which is charity. This not only adds grace to the other two colours, but causes the soul to rise to so lofty a point that it is brought near to God, and becomes very beautiful and pleasing to Him, so that it makes bold to say: ‘Albeit I am black, O daughters of Jerusalem, I am comely; wherefore the King hath loved me and hath brought me into His chambers.’277277Canticles i, 3. [A.V., i, 4.] [For ‘chambers’ the Spanish has ‘bed.’] This livery of charity, which is that of love, and causes greater love in the Beloved, not only protects the soul and hides it from the third enemy, which is the flesh (for where there is true love of God there enters neither love of self nor that of the things of self), but even gives worth to the other virtues, bestowing on them vigour and strength to protect the soul, and grace and beauty to please the Beloved with them, for without charity no virtue has grace before God. This is the purple which is spoken of in the Songs,278278Canticles iii, 10. upon which God reclines. Clad in this purple livery the soul journeys when (as has been explained above in the first stanza) it goes forth from itself in the dark night, and from all things created, ‘kindled in love with yearnings,’ by this secret ladder of contemplation, to the perfect union of love of God, its beloved salvation.279279[Or ‘health.’]
11. This, then, is the disguise which the soul says that it wears in the night of faith, upon this secret ladder, and these are its three colours. They constitute a most fit preparation for the union of the soul with God, according to its three faculties, which are understanding, memory and will. For faith voids and darkens the understanding as to all its natural intelligence, and herein prepares it for union with Divine Wisdom. Hope voids and withdraws the memory from all creature possessions; for, as Saint Paul says, hope is for that which is not possessed;280280Romans viii, 24. and thus it withdraws the memory from that which it is capable of possessing, and sets it on that for which it hopes. And for this cause hope in God alone prepares the memory purely for union with God. Charity, in the same way, voids and annihilates the affections and desires of the will for whatever is not God, and sets them upon Him alone; and thus this virtue prepares this faculty and unites it with God through love. And thus, since the function of these virtues is the withdrawal of the soul from all that is less than God, their function is consequently that of joining it with God.
12. And thus, unless it journeys earnestly, clad in the garments of these three virtues, it is impossible for the soul to attain to the perfection of union with God through love. Wherefore, in order that the soul might attain that which it desired, which was this loving and delectable union with its Beloved, this disguise and clothing which it assumed was most necessary and convenient. And likewise to have succeeded in thus clothing itself and persevering until it should obtain the end and aspiration which it had so much desired, which was the union of love, was a great and happy chance, wherefore in this line the soul also says:
Oh, happy chance!
Source: Dark Night of the Soul (CCEL)