IN this book are first set down all the stanzas which are to be expounded; afterwards, each of the stanzas is expounded separately, being set down before its exposition; and then each line is expounded separately and in turn, the line itself also being set down before the exposition. In the first two stanzas are expounded the effects of the two spiritual purgations: of the sensual part of man and of the spiritual part. In the other six are expounded various and wondrous effects of the spiritual illumination and union of love with God.
Source: Dark Night of the Soul (CCEL)