"Six at the Beginning: having sincerity... other good fortune arrives."
Correct meaning: "Holding together with sincerity, no blame"—dwelling at the start of Holding Together, it stands at the head of alliance; if there is no sincerity, no disaster is greater.
One must have sincerity and hold together with others, consistent from beginning to end; only with such sincerity can one be free of blame.
"There is sincerity filling the earthen bowl; in the end, other good fortune arrives": standing at the head of Holding Together, its response is not confined to one party; with a heart free of selfish reserve, all come to hold together with it.
Possessing this sincerity that brims in a plain earthen vessel, it treats all things with it, and all things turn toward it.
From beginning to end, they come steadily and constantly—not just a single person, but others also arrive together to bring good fortune; hence it says "in the end, other good fortune arrives." This borrows an external image to metaphorize human affairs.
Commentary: "Its response is not limited to a single line; with a mind free of selfish reserve."
Correct meaning: "Its response is not limited to a single line"—Six at the Beginning has no proper correlate, so its response is not confined to one, and thus its heart has no selfish reserve.
If the heart had a partial correlate, it would hold private attachments; because its response is not limited to one, its heart has no selfish reserve.