You must live the life of a saint. You have no choice because to do anything else is to enter into the human kingdom, which is a land of unfulfilled opportunity.
The knowledge of reincarnation assures us that life is worth living. Life is not a one-shot deal. It is forever.
Zen is discipline - the discipline of living life, the discipline of taking a breath, the discipline of not knowing and not trying to know.
The vast majority of the people who populate our planet live lives of quiet desperation that are all too often quite harsh and painful, lives in which events and circumstances usually don't turn out the way they had hoped or planned.