The answer to the signification of life should be an answer with the proof procedure. The answer to the signification of life should be an answer with the statement. The answer to the signification of life should be an answer with the warmth. The final answer is the arbitrariness. All the proof procedure, the statement and the warmth of the answer are record in this book. It contains four chapters. First, it contains the author's procedure from thinking to finding the answer. Second, the author describes people in the past carried the sadness and the lost because they could not find the answer. Third, it explains this answer is really the brightest, strongest and happiest answer. Fourth, it gives many examples for precious happiness and true warmth; the combination of the happiness confirms the arbitrariness is the final answer once again.