Sometimes I consider vaguely what is human happiness. It doesn't imply that I'm an unfortunate man, because I have a healthy family consisting of a tender wife and a vigorous daughter. Moreover, I also have a job which I'm used to for many years, so that fortunately I have been able to avoid suffering from poverty. Furthermore, I haven't succumbed to any serious illnesses even once so far, probably everyone who knows such a fact would tell me how highly I'm blessed. Certainly, Arthur Schopenhauer who is known as one of most prominent German philosophers said that our health is the integral condition to live well for a long time, because both physical health and mental one belongs to ourselves and it can't be taken away unlike external wealth including material properties or else various fame. Of course, considering that we need to have enough money to receive medical treatments, perhaps even health should be regarded as a kind of external wealth. However, what Schopenhauer emphasized isn't such a matter. He concluded that we have to cherish our own belongings being innate and ingrained, because if we find out happiness in external circumstances, we would be unable to get away from a frequent risk of losing the basis for a better life. Therefore, he recommends that people don't look forward to external satisfaction instead of paying attention to internal contentment. Probably, what Epicurus who was an Ancient Greek philosopher said is the same as him. He thought that the most refined human happiness should consist of both physical comfort and mental stability through the way of moral philosophy. In other words, he claimed that our desire for more pleasure and excitement is considered neither important nor essential. If anything, approving of desire can't help making us thirsty permanently because the nature of desire is the discovery of deficiency. Accordingly, it's an inevitable behavior for greedy people to complain about all kinds of shortage. Contented desire always produces some further complaints until the moment of death, so that it gets more significant to control our desire which doesn't know any continuing satisfaction. Those ancient people who espouse stoicism made such a thought more intense, they insisted not only that our desire ought to be restricted firmly, but also that we should regard all ordeals as proof of our splendid virtue. Of course, although I know that I'm not as the righteous as Seneca.