Zhouyi BenyiLine statement
'Gan' (to manage/trunk) is like the trunk of a tree upon which branches and leaves depend to stand. Gu represents the decayed undertakings of predecessors; hence all lines contain images of father and mother. If a son can manage them, they are repaired and revitalized.
At Six at the beginning, the decay is not yet deep and affairs are easily remedied; hence its divination is that having a son allows the decay to be managed and the departed father to be without blame.
Yet it is perilous; it cautions the diviner that one should act thus, and by recognizing peril and maintaining vigilance, there will ultimately be good fortune.