Practice is doing something you can do in order to be able to do something that you can't do. For example, I currently can't run a marathon, but I can probably run 1 km. So, if I did one day decide to run a marathon, I would do what I can do, that is, wheeze my way laboriously along for a kilometre; then, providing I did that often enough, my abilities would eventually increase to the point where I'd be able to run a marathon. The basic principle is the same for sport, or playing a musical instrument, or learning a language, or any skill you care to name. The principle is also true for our inner lives, hence the phenomenon of spiritual practice. A spiritual life is simple but it's not easy. Read the Sermon on the Mount sometime, and you'll get some idea of what it might be like to be a truly spiritual person. Jesus' description of life in the Kingdom of God might make lovely poetic reading, but I can't do it, and neither, for that matter, can anybody ...