Boon proposes a fundamental rereading of the key recogimiento text Subida del Monte Sión (1535/1538), which melds the traditionally distinct spiritual techniques of moral self-examination, Passion meditation, and negative theology into one cognitively adept path towards mystical union. She is also the first English-language scholar to treat the author of this influential work – the Renaissance physician Bernardino de Laredo, a pivotal figure in the transition from medieval to early modern spirituality on the Iberian peninsula and a source for Teresa of Avila’s mystical language.