在四象的「
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易經的生成是周文王胸懷聖德,仰觀天象(日月星辰的運行),俯察地理(山川、草木、鳥獸之跡),中揆人事(社會治亂之理),總結為天、地、風、雷、日、月、山、澤八種物資原體,分別繪出乾、坤、震、巽、坎、離、艮、兌等八卦,每卦都包含著四時八節的時義。坎應冬氣(冬至),離應夏氣(夏至),震應春氣(春分),兌應秋氣(秋分),這叫四正時。再加上四隅時(四個角度的時氣),如乾應立冬,坤應立秋,巽應立夏,艮應立春,合八節而成八卦。八卦既成,陰陽互變而成「易」。「易」字,「日」從「月」,如日月之兼明。日以繼月,月以積年,百年而世紀,周而復始,形成物資不滅。