I first read St. Teresa's Interior Castle some decades ago. Now I am about to reread it. The Introduction tells me that it took her only two months of writing time to complete the book, her last work. To quote from the Introduction: Interior Castle presents the saint's spiritual doctrine through the unifying outline of seven dwelling places among which there is a division into two sections. The first three groups of dwelling places speak of what is achievable through human efforts and the ordinary help of grace. The remaining four groups deal with the passive, or mystical, elements of the spiritual life.
It is gratifying to learn that what I've learned from the Lord is a simplified version of her synthesis. I have posted that the two parts of the spiritual journey are marked by the point of self-surrender. In the first part, we struggle on our own most of the way and in the second, we remain passive with God doing the work for us. The Lord simplifies things for me so that with a simple mind, I can understand. The Lord is always most considerate.