We should not decide short term of our life. We think about road of signal. If we just now stop by signal is red, but we can go ahead by next signal is blue. And if we just now go ahead by signal is blue, but we must stop by next signal is red. Namely, if we have problem just now, but next we have good luck. And if we have good luck just now, but next we must have problem. So, we can’t decide advantages and disadvantages by the present time. Preferably, all term of our life have same number of luck and unluck. All things consist of morals. Moral is fair completely. The basic principle of nature is an exchange of equivalents. So, all the people receive same number of advantages and disadvantages about the whole life.