Cohen gave a farewell concert which cleared his debts, required before he could be admitted to the Order, in the days before the Revolution of 1848. Instead of joining the fight in the streets, he was at his favorite devotion, spending the night in adoration before the exposed Blessed Sacrament. He entered the Discalced Carmelite novitiate at Le Broussey, in Rions, France, on 19 July of that year. He received the religious habit on 6 October 1849, being given the religious name of Augustine Mary of the Blessed Sacrament. He professed religious vows as a member of the Order on 7 October 1850. He then began to study theology. In this he faced a major challenge, as his formal education had stopped at the age of ten. Having been granted an exemption from some of the required courses, he was ordained a priest on 19 April 1851.