Scheffler began to have mystical visions, which along with his public pronouncements led local Lutheran clergy to consider him a heretic. After Franckenberg's death in June 1652, Scheffler resigned his position—he may have been forced to resign—and sought refuge under the protection of the Roman Catholic Church. Priest and poet The Lutheran authorities in the Reformed states of the Empire were not tolerant of Scheffler's increasing mysticism, and he was publicly attacked and denounced as a heretic. At this time, the Habsburg rulers (who were Catholic) were pushing for a Counter Reformation and advocated a re-Catholicisation of Europe. Scheffler sought to convert to Catholicism and was received by the Church of Saint Matthias in Breslau on 12 June 1653. Upon being received, he took the name Angelus, the Latin form of "angel", derived from the Greek ángelos (, "messenger"); for his epithet, he took Silesius (Latin for "Silesian"). It is uncertain why he took this name, but he may have added it in honour of his native Silesia or to honor a favourite scholastic, mystic or theosophic author, to distinguish himself from other famous writers of his era: perhaps the Spanish mystic writer Juan de los Ángeles (author of The Triumph of Love) or Lutheran theologian Johann Angelus in Darmstadt. He no longer used the name Scheffler, but did on occasion use his first name, Johann. From 1653 until his death, he used the names Angelus Silesius and also Johann Angelus Silesius. Shortly after his conversion, on 24 March 1654, Silesius received an appointment as Imperial Court Physician to Ferdinand III, the Holy Roman Emperor. However, this was probably an honorary position to offer some official protection against Lutheran attackers, as Silesius never went to Vienna to serve the Imperial Court. It is very likely that he never practiced medicine after his conversion to Catholicism. In the late 1650s, he sought permission (a nihil obstat or imprimatur) from Catholic authorities in Vienna and Breslau to begin publishing his poetry. He had begun writing poetry at an early age, publishing a few occasional pieces when a schoolboy in 1641 and 1642. He attempted to publish poetry while working for the Duke of Württemberg-Oels, but was refused permission by the Duke's orthodox Lutheran court clergyman, Christoph Freitag. However, in 1657, after obtaining the approval of the Catholic Church, two collections of his poems were published—the works for which he is known—Heilige Seelenlust