Who is God from The Interior Castle and what is their importance?

Teresa refers to God most often in The Interior Castle as her Beloved. He is the object of the sisters' shared quest and of their collective and individual devotion. Teresa reveals an intimate and tender devotion to God in her work, seeking to identify with the lifestyle and selfless love of Jesus during His time on earth, and looking to God to shape that character in her in whatever way He chooses. She continually reminds her readers God has perfect insight into the condition of their hearts, their destinies, and the process that will be most effective in preparing them for what He has for them.