What is the author's tone in The Interior Castle by Teresa of Avila?

Teresa's tone is a mix of reverent love for the Object and subject of her book, God and prayer, and of self-deprecating apology for not feeling entirely qualified to write on such an important topic. She is vulnerable and compassionate, very obviously addressing women she cares about very deeply. She is also transparently deeply in love with the Savior and Lover of her soul, and that lends a tone of reverence and sweetness to her style as she writes to instruct others to attain a similar depth of intimacy with God.