14 There is likewise another reason, which is no less effectual than the last, by which we may understand how the soul journeys securely in darkness; it is derived from the fortitude by which the soul is at once inspired in these obscure and afflictive dark waters of God. For after all, though the waters be dark, they are none the less waters, and therefore they cannot but refresh and fortify the soul in that which is most needful for it, although in darkness and with affliction. For the soul immediately perceives in itself a genuine determination and an effectual desire to do naught which it understands to be an offence to God, and to omit to do naught that seems to be for His service. For that dark love cleaves to the soul, causing it a most watchful care and an inward solicitude concerning that which it must do, or must not do, for His sake, in order to please Him. It will consider and ask itself a thousand times if it has given Him cause to be offended; and all this it will do with much greater care and solicitude than before, as has already been said with respect to the yearnings of love. For here all the desires and energies and faculties of the soul are recollected from all things else, and its effort and strength are employed in pleasing its God alone. After this manner the soul goes forth from itself and from all created things to the sweet and delectable union of love of God, ‘In darkness and secure.’
By the secret ladder, disguised.
Source: Dark Night of the Soul (CCEL)