First of all, this is not in the I Ching. This is a formula for reading horoscopes. It means that if there are seven kills in the horoscope, it is good and powerful.
The person below gave the full sentence, so I will explain it. Ding Huo gave birth to Ziyue. Originally, the seven kills were in the moon order. The four pillars will come again and the seven kills will not be mixed. In winter, it is natural for the Jiamu to be born, which kills the seal and transforms it into a noble one. If you follow the western path, your luck with gold will be ruined.