From 'Six at the Beginning: tethered to a bronze brake' to 'a lean pig truly trotting.'
Sub-commentary: 'Tethered to a bronze brake, perseverance brings good fortune': metal is a hard and firm substance; the brake is the master that controls movement, referring to Nine in the Fourth Place.
Six at the Beginning is yin in nature; if it tethers itself to its proper correspondence to follow the fourth line, it will be correct and auspicious; hence 'tethered to a bronze brake, perseverance brings good fortune.'
'If it has somewhere to go, it sees misfortune': if it is not tethered to one and moves elsewhere, only misfortune will be encountered; hence 'if it has somewhere to go, it sees misfortune.'
'A lean pig truly trotting': Six at the Beginning dwells at the start of Meeting; as one yielding line bearing five firm lines, this is failing to tether to the bronze brake and having somewhere to go.
Going forward without being tethered is like a lean pig restlessly trotting about; hence 'a lean pig truly trotting.' A lean pig refers to a sow. Among pigs, the boar is strong and the sow is weak, hence a sow is called a lean pig.
Possessing yin nature and being lewd and restless, the sow is especially extreme, which is why it is taken as an allegory. Note: 'The brake is the master that controls movement.' Sub-commentary: Regarding the brake as an object, various interpretations differ.
The followers of Wang Su all take it as a spinning and weaving implement used by women. Only Ma Rong says: 'The brake is under a carriage, used to stop the wheels from moving.' Wang's note says: 'The brake is the master that controls movement,' which aligns with Ma Rong.