There are so many different ways to think about the spiritual life. And of course, in our country there are so many different variations of religious experiences. There are liberals and conservatives. There are fundamentalists and Pentecostals. Besides the dizzying variety of Christian traditions, there are many different non-Christian traditions. There are the major traditions, such as Islam, Buddhism, Hinduism, and so on. There are the slightly more obscure traditions, such as Sikhism, Jainism, etc. And then there are more fringe groups and, even, pseudo-religions. There are defining doctrines and religious practices. Some of these are specific to a particular tradition or a few traditions, such as the koan , which is used in Zen Buddhism for example. Other defining doctrines or practices are common across the religious board. Something like meditation would be a good example. Christians meditate; B...