Everyone has a certain ideal, which determines the direction of his efforts and judgment. In this sense, I have never regarded ease and happiness as the purpose of life itself-this ethical basis, which I call the ideal of pigsty. (Einstein)

Rainbow, after fierce fighting with lightning;

Ideals are born after struggling with difficulties. (proverb)

Looking back on yesterday, you should have a clear conscience;

Facing today, we should be confident;

Looking forward to tomorrow, we should cherish it more. (proverb)