I don't know if it's cold at the age of 20. Pine and cypress come from the introduction of Xunzi, which means that there is no coldest time in a year, and I can't know whether the pine and cypress wither at last. The original text is: a gentleman is poor without losing money, tired and meticulous, and he never forgets his fine words when he is in trouble. It is not difficult to know pines and cypresses at the age of eighteen, but it is not difficult to know a gentleman every day.

Cold: refers to the cold season of the year, deep winter. Metaphor is perseverance in difficulties and unyielding moral integrity in troubled times; Metaphor friendship lasts forever. The Analects of Confucius: I was cold at the age, and then I knew that pine and cypress were dying.

It is difficult to know pine and cypress if it is neither cold nor hot. The original intention of a gentleman is to know that pines and cypresses are not afraid of cold when it is cold, and to show the true nature of a gentleman in times of crisis. Morality is that it is difficult for a person to identify his strong gentleman qualities without going through severe experiences and tests.

Xunzi: About 365438 BC+03 BC-238 BC), whose real name was Qing, was born in the Chinese nation (Han nationality), and was a famous thinker, writer and politician of Zhao at the end of the Warring States Period. Xunzi developed Confucianism. On the issue of human nature, he advocated the theory of evil nature, advocated that human nature was evil, denied the innate moral concept, and emphasized the influence of acquired environment and education on people. His theory is often used by later generations to imitate Mencius? Theory of good nature? Comparatively speaking, Xunzi also made outstanding contributions in sorting out Confucian classics.