St. Teresa adds that Catherine spent more than eight years in this desert cave, that after having exhausted the small provision of three loaves left her by the hermit who had served her as a guide, she had lived solely on roots and wild herbs, but that, after several years, she met with a shepherd, who thenceforward faithfully supplied her with bread, of which she, nevertheless, ate but once in three days. The discipline which she took with a large chain lasted often for an hour and a half, and sometimes two hours. Her hair-cloth was so rough that a woman, returning from a pilgrimage, having asked hospitality of her, told me (it is still St. Teresa who speaks), that feigning sleep, she saw the holy recluse take off her hair-cloth and wipe it clean, for it was full of blood. The warfare she had to sustain against the demons made her suffer still more than her austerities; she told our sisters that they appeared to her, now in the form of great dogs who sprang on her shoulders, and now in that of snakes; but do as they might, they could not make her afraid.
She heard Mass in a convent of the Sisters of Mercy, a quarter of a league distant; sometimes she made the journey on her knees. She wore a tunic of coarse serge, and over that a robe of drugget so fashioned that she was taken for a man.
Nevertheless, the fame of her sanctity soon spread everywhere, and the people conceived so great a veneration for her that they flocked from every side, so that, on certain days, the surrounding country was covered with vehicles full of people going to see her.
"About this time," says St. Teresa, "she was seized with a great desire to found near her cave a monastery of religious, but being undecided in her choice of the order, she postponed for a time the execution of her design. One day while at prayer before a crucifix which she always carried about her, Our Lord showed her a white mantle, and gave her to understand that she was to found a monastery of barefooted Carmelites. She knew not till then that such an order existed, as she had never heard it mentioned; indeed, we had then but two monasteries of reformed Carmelites, that of Moncera and that of Pastrana. Catherine was speedily informed of the existence of this last. As Pastrana belonged to the Princess of Eboli, her former friend, she set out for that town with the firm resolution of doing what Our Lord had enjoined her to do. It was at Pastrana, in the church of our religious, that the Blessed Catherine took the habit of Our Lady of Mount Carmel, having no intention, notwithstanding that act, to embrace the religious life. Our Lord conducted her by another way, and she never felt any attraction towards that state. What kept her away from it was the fear of being obliged through obedience to moderate her austerities and quit her solitude."
As she had worn man's apparel ever since she had been in the desert, she would not now change it. So, in laying aside her hermit's robe, and assuming that of Carmel, she took a habit like that of the barefooted Carmelite monks, and wore it till her last breath. In this Catherine was led by a very special way.
Catherine had been preceded at Pastrana by the account of the wonders which had marked the eight years she had spent in her cave; she was thus greeted as a saint as soon as she appeared; no one was surprised to see her in her Carmelite habit, a cowl on her head, a white mantle on her shoulders, a robe of coarse drugget, and a leathern girdle. God permitted the appearance of Catherine at the court of Philip II. as a virgin with the heart of a man, victorious over all the weakness, of her sex, and rivalling in her austerities the most famous penitents of the desert. At the Escurial, she observed the same abstinence as in her hermitage; there, as in her cave, she took but one hour's sleep, and gave to prayer the rest of the time at her disposal.
From the Escurial, Catherine returned to Madrid. From the carriage in which she rode, she gave her blessing to the multitudes who crowded the road as she passed. … The Nuncio, having sent for her, reproached her for wearing the apparel of a man, and for taking it upon her to give her blessing, like a bishop. The humble virgin heard all prostrate on the ground. When the Nuncio had finished speaking, she arose and justified herself with that holy simplicity peculiar to herself. The legate of the Holy See, perceiving then that God was leading the Blessed Catherine by an extraordinary way, left her at liberty to wear that costume, blessed her, and recommended himself to her prayers.
In Madrid Catherine again met Don Juan of Austria, who had been appointed Generalissimo of the Christian fleet directed against the Turks. He gave her the name of mother, and regarded her as a Saint. After having given some wise counsel to the young prince, she predicted to him that he should obtain a victory over the enemies of the Christian name. It was a happy day in the life of Don Juan on which he heard these prophetic words. Kneeling on the ground, with clasped hands and tearful eyes, the future liberator of Christendom asked Catherine's blessing, and arose with a heart strengthened by an invincible hope.
The Carmelites of Toledo, amongst whom she spent some time, endeavoring to persuade her to diminish her austerities a little, she replied in these memorable words, which reveal to us the secret of her life: "When one has seen, as I have, what Purgatory and Hell are, one cannot do too much to draw souls from one, and preserve them from the other; I may not spare myself, since I have offered myself in sacrifice for them."
On the 7th October, 1571, Catherine was warned by a light from above that the great combat against the Turks was to take place that day. She macerated herself with fearful rigor, and offered herself as a victim to the anger of God, justly indignant at the sins of His people. She addressed to the Saviour of men the most tender supplications, when, all at once, seized with a holy transport, she uttered in a distinct voice these words, which were heard by several persons of the Court: "O Lord, the hour is come, help Thy Church; give the victory to the Catholic chiefs; have pity on so many kingdoms which are Thine own, preserve them from ruin! The wind is against us: my God, if Thou order it not to change, we perish!"