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In page John of the Cross:

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However, the belief that John was taught at both the Carmelite College of San Andrès and at the University of Salamanca has been challenged.[2] Bezares calls into question whether John even studied theology at the University of Salamanca. The philosophy courses John probably took in logic, natural and moral philosophy, can be reconstructed, but Bezares argues that John in fact abandoned his studies at Salamanca in 1568 to join Teresa, rather than graduating.[3] In the first biography of John, published in 1628, it is claimed, on the basis of information from John's fellow students, that he in 1567 made a special study of mystical writers, in particular of Pseudo-Dionysius and Pope Gregory I.[4][5] There is little consensus from John's early years or potential influences.[citation needed]