What does double-edged fortune telling mean?

What does it mean to use a positive blade for fortune telling?

Hello.

Sheep blade: This is a term in the book of life. It's a bad star in the sky, the first one to kill. I like favoring the official (seven kills), printing ribbons, avoiding opposing chanting, avoiding Kui Gang, and avoiding the underworld. What is a sheep blade? A, C, E, G and N are all patients. B, D, Ji, Xin, and Gui have no edge. Yang blade got its name.

This passage is not easy to understand. Remember, the sheep blade is a fierce god, and it takes seven kills (also a fierce god) to control the fierce. Fight poison with poison. If there are no seven kills in the eight characters, you can make a sheep blade if you encounter seven kills at a certain time in a certain month.

Good luck.