Her masterpiece is the _Castillo interior_, of which Fray Luis writes:—"Let naught be blotted out, save when she herself emended: which was seldom." And once more he commends her to her readers, saying:—"She, who had seen God face to face, now reveals Him unto you." With all her sublimity, her enraptured vision of things heavenly, her "large draughts of intellectual day," Santa Teresa illustrates the combination of the loftiest mysticism with the finest practical sense, and her style varies, takes ever its colour from its subject. Familiar and maternal in her letters, enraptured in her _Conceptos del Amor de Dios_, she handles with equal skill the trifles of our petty lives and—to use Luis de León's phrase—"the highest and most generous philosophy that was ever dreamed." And from her briefest sentence shines the vigorous soul of one born to govern, one who governed in such wise that a helpless Nuncio denounced her as "restless, disobedient, contumacious, an inventress of new doctrines tricked out with piety, a breaker of the cloister-rule, a despiser of the apostolic precept which forbiddeth a woman to teach." Santa Teresa taught because she must, and all that she wrote was written by compulsion, under orders from her superior. She could never have understood the female novelist's desire for publicity; and, had she realised it, merry as her humour was, she would scarcely have smiled. For she was, both by descent and temperament, a gentlewoman—_de sangre muy limpia_, as she writes more than once, with a tinge of satisfaction which shows that the convent discipline had not stifled her pride of race any more than it had quenched her gaiety. She always remembers that she comes from Castile, and the fact is evidenced in her writings, with their delicious old-world savour. Boscán and Garcilaso might influence courtiers and learned poets; but they were impotent against the brave Castilian of Sor Teresa de Jesús, who wields her instrument with incomparable mastery. It were a sin to attempt a rendering of her artless songs, with their resplendent gleams of ecstasy and passion. But some idea of her general manner, when untouched by the inspiration of her mystic nuptials, may be gathered from a passage which Froude has Englished:—