The Interior Castle of St. TeresaSt. Teresa of Avila (1515-82) envisioned the soul as "a castle made of a single diamond... in which there are many rooms, just as in Heaven there are many mansions." This idea came to her in about the year 1579.A friend of hers, Fray Diego de Yepes wrote that God "showed her a most beautiful crystal globe, made in the shape of a castle, and containing seven mansions, in the seventh and innermost of which was the King of Glory...