He left the following works, which for the first time appeared at Barcelona in 1619.
"The Ascent of Mount Carmel", an explanation of some verses beginning: "In a dark night with anxious love inflamed". This work was to have comprised four books, but breaks off in the middle of the third.
"The Dark Night of the Soul", another explanation of the same verses, breaking off in the second book. Both these works were written soon after his escape from prison, and, though incomplete, supplement each other, forming a full treatise on mystic theology.
An explanation of the "Spiritual Canticle", (a paraphrase of the Canticle of Canticles) beginning "Where hast Thou hidden Thyself?" composed part during his imprisonment, and completed and commented upon some years later at the request of Venerable Anne of Jesus.
An explanation of a poem beginning: "O Living Flame of Love", written about 1584 at the bidding of Dona Ana de Penalosa.
Some instructions and precautions on matters spiritual.
Some twenty letters, chiefly to his penitents. Unfortunately the bulk of his correspondence, including numerous letters to and from St. Teresa, was destroyed, partly by himself, partly during the persecutions to which he fell a victim.
"Poems", of which twenty-six have been hitherto published, viz., twenty in the older editions, and recently six more, discovered partly at the National Library at Madrid, and partly at the convent of Carmelite nuns at Pamplona.
"A Collection of Spiritual Maxims" (in some editions to the number of one hundred, and in others three hundred and sixty-five) can scarcely count as an independent work, as they are culled from his writings.
It has been recorded that during his studies St. John particularly relished psychology; this is amply borne out by his writings. He was not what one would term a scholar, but he was intimately acquainted with the "Summa" of St. Thomas Aquinas, as almost every page of his works proves. Holy Scripture he seems to have known by heart, yet he evidently obtained his knowledge more by meditation than in the lecture room. But there is no vestige of influence on him of the mystical teaching of the Fathers, the Aeropagite, Augustine, Gregory, Bernard, Bonaventure,etc., Hugh of St. Victor, or the German Dominican school. The few quotations from patristic works are easily traced to the Breviary or the "Summa". In the absence of any conscious or unconscious influence of earlier mystical schools, his own system, like that of St. Teresa, whose influence is obvious throughout, might be termed empirical mysticism. They both start from their own experience, St. Teresa avowedly so, while St. John, who hardly ever speaks of himself, "invents nothing" (to quote Cardinal Wiseman), "borrows nothing from others, but gives us clearly the results of his own experience in himself and others. He presents you with a portrait, not with a fancy picture. He represents the ideal of one who has passed, as he had done, through the career of the spiritual life, through its struggles and its victories".
His axiom is that the soul must empty itself of self in order to be filled with God, that it must be purified of the last traces of earthly dross before it is fit to become united with God. In the application of this simple maxim he shows the most uncompromising logic. Supposing the soul with which he deals to be habitually in the state of grace and pushing forward to better things, he overtakes it on the very road leading it, in its opinion to God, and lays open before its eyes a number of sores of which it was altogether ignorant, viz. What he terms the spiritual capital sins. Not until these are removed (a most formidable task) is it fit to be admitted to what he calls the "Dark Night", which consists in the passive purgation, where God by heavy trials, particularly interior ones, perfects and completes what the soul had begun of its own accord. It is now passive, but not inert, for by submitting to the Divine operation it co-operates in the measure of its power. Here lies one of the essential differences between St. John's mysticism and a false quietism. The perfect purgation of the soul in the present life leaves it free to act with wonderful energy: in fact it might almost be said to obtain a share in God's omnipotence, as is shown in the marvelous deeds of so many saints. As the soul emerges from the Dark Night it enters into the full noonlight described in the "Spiritual Canticle" and the "Living Flame of Love". St. John leads it to the highest heights, in fact to the point where it becomes a"partaker of the Divine Nature". It is here that the necessity of the previous cleansing is clearly perceived the pain of the mortification of all the senses and the powers and faculties of the soul being amply repaid by the glory which is now being revealed in it.
St. John has often been represented as a grim character; nothing could be more untrue. He was indeed austere in the extreme with himself, and, to some extent, also with others, but both from his writings and from the depositions of those who knew him, we see in him a man overflowing with charity and kindness, a poetical mind deeply influenced by all that is beautiful and attractive.
The best life of St. John of the Cross was written by JEROME DE SAN JOSÉ (Madrid, 1641), but, not being approved by the superiors, it was not incorporated in the chronicles of the order, and the author lost his position of annalist on account of it.
1 -[Saint John of the Cross]
2 -[Saint John of the Cross : Life]
3 -[Saint John of the Cross : Works]
Source : BENEDICT ZIMMERMAN, Transcribed by Marie Jutras in http://www.newadvent.org/