Words of life specify what Christians believe in. They instruct to criticise reality and give hope for change. How can we speak about these words of life theologically responsible and in understandable language today? How can their controversial history and cultural perspectives come to life? How can these words participate in clarifying the connection of Faith, knowledge, learning and doing? This "ABC of protestant thinking" was created by competent experts from university and practical church. It reveals, keeping an ecumenical open mind, the programmatic terms of protestant thinking and introduces to the multitude of theological understanding.