Prayer is a common religious action in all religions. For Christianity, prayer is to recognize everyone’s natural image given by God and to attain harmonious relation with God, people and environment. By constantly praying, he is able to look at God directly in his spiritual eye, and to enter the realm of the simple and silence-“the One”. Finally, he recognizes that the daily life within God is the most ideal state for Christian. But this ideal state is not achieved by one or two mystical experiences. It is necessary to pray constantly, to understand the spiritual state and problems, and to overcome every difficulty. In this article, the author takes the Jesus’ prayer as an example to examine the conscious development during praying. For Christians, although it is important to achieve the state of “the One”, the process of rising conscious layer by praying constantly in daily life is more important.