The Interior Castles is a very wonderful book on how to get closer to God and how to overcome the trials come upon you. St. Theresa originally wrote this for the sisters in her convent, at the urging of a friend of hers. She says that the way to the "ultimate marriage with God" is through humility and a humble life, and through prayer. She also says that we have to be aware of when God speaks to us, and know when Satan is trying to veer us away from Him.

The reason why I gave it only three stars was because St. Theresa always seems to ramble off and it makes it hard to understand what she's talking about. I was lucky to have read the E. Allison Peers translation, because if I read the Mirabai Starr edition I would have been exasperated.