But the third Sister, who is also the youngest—! Hush! whisper whilst we talk of her! Her kingdom is not large, or else no flesh should live; but within that kingdom all power is hers. Her head, turreted like that of Cybele, rises almost beyond the reach of sight. She droops not; and her eyes, rising so high, might be hidden by distance. But, being what they are, they cannot be hidden; through the treble veil of crape which she wears the fierce light of a blazing misery, that rests not for matins or for vespers, for noon of day or noon of night, for ebbing or for flowing tide, may be read from the very ground. She is the defier of God. She also is the mother of lunacies, and the suggestress of suicides. Deep lie the roots of her power; but narrow is the nation that she rules. For she can approach only those in whom a profound nature has been upheaved by central convulsions; in whom the heart trembles and the brain rocks under conspiracies of tempest from without and tempest from within. Madonna moves with uncertain steps, fast or slow, but still with tragic grace. Our Lady of Sighs creeps timidly and stealthily. But this youngest Sister moves with incalculable motions, bounding, and with tiger's leaps. She carries no key; for, though coming rarely amongst men, she storms all doors at which she is permitted to enter at all. And her name is Mater Tenebrarum—our Lady of Darkness.
—Thomas de Quincey
"Levana and Our Three Ladies of Sorrow"
Suspiria de Profundis