The writings of Teresa of Avila are surprisingly modern. Not only in what she says but also in how she says it. She wrote spontaneously, unpretentiously, and only about things she knew from personal experience: everyday concerns, interpersonal issues, and the management of business endeavors. Her writings are filled with witty expressions, jokes, humorous allusions, small malicious remarks, vivid imagery, and very human observations and advice. However, her most important message—especially to women—is to get to know oneself, to lead a self-determined and active life, and to live spirituality in everyday life. Thus, love also means being mindful of oneself. Alois Prinz has selected from the extensive works of Teresa of Avila all the thoughts that can still serve as a guide for a fulfilling life today.