15.直、方、大，不習，無不利。——出自《坤·六二爻》
今譯：人隻要在大的品行上外直內方，那麼即使個別小處失於嚴肅，也會無往而不利。
衍言：心正直則無私，行端正則不結黨、不佞媚，其德自然盛大。
《周易》小詞典：坤卦六二爻得位中正，象征人率直方正而品德偉大，因而無需修習，也自然無不利。
Being straight, square, and great, it will be in every respect advantageous even without repeated efforts.——- from The Second Line Divided, Kun
Modern interpretation: If one is straight outside but square inside, he will go smoothly everywhere even if he is not always serious about unimportant issues.
Moral: If one is upright, he is unselfish. An upright man never gang up and flatter. He is certainly great in character.
Glossary: The second line, divided, in Kun symbolizes the attribute of being straight, square, and great. A man like this will be in every respect advantageous without repeated efforts.