From 'Nine in the Fifth Place' to 'no remorse.' Correct meaning: 'Influence in the flesh of the spine; no remorse.' The spine flesh lies above the heart and below the mouth.
The fourth line already occupies the middle of the body, being influenced by the heart and spirit; the fifth advances above the fourth, so its influence is in the spine.
The spine is already past the heart, so advancing it cannot exert great influence; yet being above the heart, retreating it cannot be without purpose. Its purpose is shallow and slight, so it merely achieves 'no remorse.'
Thus it says: 'Influence in the flesh of the spine; no remorse.' Commenting on the note 'the flesh of the spine lies above the heart and below the mouth': Zixia's Commentary on the Changes says: 'On the backbone it is called mei.' Ma Rong says: 'Mei means the back.'
Zheng Xuan says: 'Mei is the flesh along the spine.' Wang Su says: 'Mei lies on the back, flanking the spine.' The Shuowen says: 'Mei is the meat of the back.' Although the various theories differ, they all place it generally above the heart.
Wang Fusi treats the fourth line as the heart-spirit and the top line as the cheeks, and the fifth line lies between the top and the fourth; hence he directly states 'above the heart and below the mouth,' clarifying that it is shallower than the heart-spirit yet thicker than mere speech.