Six in the beginning means

Setting right what has been spoiled by the father.

If there is a son,

No blame rests upon the departed father.

Danger. In the end good fortune.

Rigid adherence to tradition has resulted in decay. But the decay has not yet penetrated deeply and so can still be easily remedied. It is as if a son were compensating for the decay his father allowed to creep in. Then no blame attaches to the father. However, one must not overlook the danger or take the matter too lightly. Only if one is conscious of the danger connected with every reform will everything go well in the end.