First, it describes this dark contemplation as ‘secret,’ since, as we have indicated above, it is mystical theology, which theologians call secret wisdom, and which, as Saint Thomas says is communicated and infused into the soul through love.[213] This happens secretly and in darkness, so as to be hidden from the work of the understanding and of other faculties. Wherefore, inasmuch as the faculties aforementioned attain not to it, but the Holy Spirit infuses and orders it in the soul, as says the Bride in the Songs, without either its knowledge or its understanding, it is called secret. And, in truth, not only does the soul not understand it, but there is none that does so, not even the devil; inasmuch as the Master Who teaches the soul is within it in its substance, to which the devil may not attain, neither may natural sense nor understanding.

And it is not for this reason alone that it may be called secret, but likewise because of the effects which it produces in the soul. For it is secret not only in the darknesses and afflictions of purgation, when this wisdom of love purges the soul, and the soul is unable to speak of it, but equally so afterwards in illumination, when this wisdom is communicated to it most clearly. Even then it is still so secret that the soul cannot speak of it and give it a name whereby it may be called; for, apart from the fact that the soul has no desire to speak of it, it can find no suitable way or manner or similitude by which it may be able to describe such lofty understanding and such delicate spiritual feeling. And thus, even though the soul might have a great desire to express it and might find many ways in which to describe it, it would still be secret and remain undescribed. For, as that inward wisdom is so simple, so general and so spiritual that it has not entered into the understanding enwrapped or cloaked in any form or image subject to sense, it follows that sense and imagination (as it has not entered through them nor has taken their form and colour) cannot account for it or imagine it, so as to say anything concerning it, although the soul be clearly aware that it is experiencing and partaking of that rare and delectable wisdom. It is like one who sees something never seen before, whereof he has not even seen the like; although he might understand its nature and have experience of it, he would be unable to give it a name, or say what it is, however much he tried to do so, and this in spite of its being a thing which he had perceived with the senses. How much less, then, could he describe a thing that has not entered through the senses! For the language of God has this characteristic that, since it is very intimate and spiritual in its relations with the soul, it transcends every sense and at once makes all harmony and capacity of the outward and inward senses to cease and be dumb. —St John of the Cros ‘Dark Night of the Soul’