Her 2007 book, "Entering the Castle" draws upon the writings of Saint Teresa of Ávila, a 16th-century Carmelite nun, who wrote her most important work, The Interior Castle (1577), towards the end of her life.
It is also not unduly speculative that living in a walled city like Ávila, not to mention a Carmelite monastery, must have influenced her thinking from an interior perspective.
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