The ancients needed rain when planting, and the wind when sailing. The water and wind can arrive on time according to the season. The ancients called this natural phenomenon and order "belief. " With "belief", people can carry out productive labor. Normal life. So they always sincerely ask God or the gods to bless them in order to get accurate and practical "belief". People later realized that human beings also need this kind of faith, and people's faith needs to be guaranteed by "sincerity" "To be honest" refers to an attitude inside people. Faith is the external manifestation of sincerity; "honest" and "faith" are two sides of the same body. What's the point of this text? ['Origin of integrity.', 'Ancient China paid special attention to the integrity.', 'Inheritance of "sincerity" and "faith".', '"Sincerity" and "Letter" on both sides.']