Since these proficients are still at a very low stage of progress, and follow their own nature closely in the intercourse and dealings which they have with God, because the gold of their spirit is not yet purified and refined, they still think of God as little children, and speak of God as little children, and feel and experience God as little children, even as Saint Paul says, because they have not reached perfection, which is the union of the soul with God. In the state of union, however, they will work great things in the spirit, even as grown men, and their works and faculties will then be Divine rather than human, as will afterwards be said. To this end God is pleased to strip them of this old man and clothe them with the new man, who is created according to God, as the Apostle says, in the newness of sense. He strips their faculties, affections and feelings, both spiritual and sensual, both outward and inward, leaving the understanding dark, the will dry, the memory empty and the affections in the deepest affliction, bitterness and constraint, taking from the soul the pleasure and experience of spiritual blessings which it had aforetime, in order to make of this privation one of the principles which are requisite in the spirit so that there may be introduced into it and united with it the spiritual form of the spirit, which is the union of love. All this the Lord works in the soul by means of a pure and dark contemplation, as the soul explains in the first stanza.

As a result of this, the soul feels itself to be perishing and melting away, in the presence and sight of its miseries, in a cruel spiritual death, even as if it had been swallowed by a beast and felt itself being devoured in the darkness of its belly, suffering such anguish as was endured by Jonas in the belly of that beast of the sea. For in this sepulchre of dark death it must needs abide until the spiritual resurrection which it hopes for.

This was also described by Job, who had had experience and, in these words: 'I, who was wont to be wealthy and rich, am suddenly undone and broken to pieces; He hath taken me by my neck; He hath broken me and set me up for His mark to wound me; He hath compassed me round about with His lances; He hath wounded all my loins; He hath not spared; He hath poured out my bowels on the earth; He hath broken me with wound upon wound; He hath assailed me as a strong giant; I have sewed sackcloth upon my skin and have covered my flesh with ashes; my face is become swollen with weeping and mine eyes are blinded.'

But there is another thing here that afflicts and distresses the soul greatly, which is that, as this dark night has hindered its faculties and affections in this way, it is unable to raise its affection or its mind to God, neither can it pray to Him, thinking, as Jeremias thought concerning himself, that God has set a cloud before it through which its prayer cannot pass. For it is this that is meant by that which is said in the passage referred to, namely: 'He hath shut and enclosed my paths with square stones.' And if it sometimes prays it does so with such lack of strength and of sweetness that it thinks that God neither hears it nor pays heed to it, as this Prophet likewise declares in the same passage, saying: 'When I cry and entreat, He hath shut out my prayer.' In truth this is no time for the soul to speak with God; it should rather put its mouth in the dust, as Jeremias says, so that perchance there may come to it some present hope, and it may endure its purgation with patience. It is God who is passively working here in the soul; wherefore the soul can do nothing.

Until the Lord shall have completely purged it after the manner that He wills, no means or remedy is of any service or profit for the relief of its affliction; the more so because the soul is as powerless in this case as one who has been imprisoned in a dark dungeon, and is bound hand and foot, and can neither move nor see, nor feel any favour whether from above or from below, until the spirit is humbled, softened and purified, and grows so keen and delicate and pure that it can become one with the Spirit of God, according to the degree of union of love which His mercy is pleased to grant it; in proportion to this the purgation is of greater or less severity and of greater or less duration.

Inasmuch as not only is the understanding here purged of its light, and the will of its affections, but the memory is also purged of meditation and knowledge, it is well that it be likewise annihilated with respect to all these things, so that that which David says of himself in this purgation may by fulfilled, namely: 'I was annihilated and I knew not.'  For, in order that the soul may be divinely prepared and tempered with its faculties for the Divine union of love, it would be well for it to be first of all absorbed, with all its faculties, in this Divine and dark spiritual light of contemplation, and thus to be withdrawn from all the affections and apprehensions of the creatures, which condition ordinarily continues in proportion to its intensity. And thus, the simpler and the purer is this Divine light in its assault upon the soul, the more does it darken it, void it and annihilate it according to its particular apprehensions and affections, with regard both to things above and to things below.

And this is the characteristic of the spirit that is purged and annihilated with respect to all particular affections and objects of the understanding, that in this state wherein it has pleasure in nothing and understands nothing in particular, but dwells in its emptiness, darkness and obscurity, it is fully prepared to embrace everything to the end that those words of Saint Paul may be fulfilled in it: Nihil habentes, et omnia possidentes.  [Google translate: Having nothing, and yet possessing all things.] For such poverty of spirit as this would deserve such happiness.

-- Dark Night of the Soul, by St. John of the Cross

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Man is not an end, but a bridge between the animal kingdom and the Super-man. He may attain the condition of Super-man by a process of "self-upraising" (Selbstaufhebung); by an intensity of suffering so great that it leads at last to optimism. The first step is that which his disciples had already taken: intense disgust of themselves, leading them to pessimism or asceticism. Zarathustra tells them that they have not suffered enough. "For ye suffer on account of what ye are; ye have not yet suffered on account of what Man is." Only by attaining this supreme degree of pain and disgust can they develop sufficient energy to cross the last gulf which separates them from the state of Super-man.
-- Nietzsche and Madame Blavatsky: Their Doctrines Stated and Compared, by Theosophical Quarterly Magazine 1909-1912