《易传·彖传上·坤》
坤用厚德载养万物，德性相合而无边无际，能包含宽厚而广大，众物全得 亨通 。 牝马 属于地类，奔行于地而无边，柔顺而宜于守正，君子有所往， 先迷 而失其道， 后 柔顺而得其道。 西南得到朋友 ，则是与朋友同行， 东北丧失朋友 ，最终将有吉庆。 安于守正 之吉，是因为应合地道而无边。
坤厚载物，德合无疆。含弘光大，品物咸亨。牝马地类，行地无疆，柔顺利贞。君子攸行，先迷失道，後顺得常。西南得朋，乃与类行；东北丧朋，乃终有庆。安贞之吉，应地无疆。
Earthly virtue supports all things and its virtue is boundless. It can contain the broad and the great, and all things obtain good fortune. The feminine horse belongs to the category of earth and runs on the earth without limit. It is gentle and right to observe the correct path. When a gentleman has somewhere to go, he will first lose his way, then be gentle and obtain the way. If friends are obtained in the southwest, it means that one walks together with friends. If friends are lost in the northeast, there will be good fortune in the end. The good fortune of being secure in observing the correct path is that it corresponds with the law of the earth and is boundless.