John of the Cross, Saint. ‘The Dark Night of the Soul.’ In: The Complete Works of St John of the Cross. Translated by E. Allison Peers. London, 1934-35.
Jung’s formal bibliography for the Practice of Psychotherapy cites John of the Cross’s ‘Dark Night of the Soul’ as a source, establishing its direct relevance to his clinical and psychological writing.
, Collected Works Volume 16: The Practice of Psychotherapy, 1954thesis