I discovered that it is necessary, absolutely necessary, to believe in nothing. That is, we have to believe in something which has no form and no color--something which exists before all forms and colors appear... No matter what god or doctrine you believe in, if you become attached to it, your belief will be based more or less on a self-centered idea.
While you are continuing this practice, week after week, year after year, your experience will become deeper and deeper, and your experience will cover everything you do in your everyday life. The most important thing is to forget all gaining ideas, all dualistic ideas. In other words, just practice zazen in a certain posture. Do not think about anything. Just remain on your cushion without expecting anything. Then eventually you will resume your own true nature. That is to say, your own true nature resumes itself.