Not all are mystics like Teresa of Avila, nor are all intellectuals like Thomas Aquinas. One is not superior to the other. This writing is for the mystic. Her writing and aided by the translation of E. Allison Peers, is so conversational and written in a down to earth and highly accessible language style. Not written in ivory tower scholarly dialogue, but it is, at the same time, quite lofty.
Sr. Teresa is a tour guide through the mansions of prayer with the utmost reverence for our Lord, obedience, and charity for the faith. She gives practical insights to scripture, and how to know what is really from God, and what is from the deceiver. I loved it, and found it highly comforting. I couldn't put it down and took so many notes that I've referred back to. Highly recommended.