What is the saying that fortune telling is lame and blind?

What are the ambiguous statements about fortune telling?

I think there are generally two kinds of fortune tellers. One is the eye of the sky, that is, there are some incredible things attached to the fortune teller. This state will not last long, but it is very accurate. Often, you don't have to say anything yourself. The other person can read everything about you like watching a movie. This situation is rare! The second is the reasoning based on the Book of Changes, as well as the gossip of lines, the phenomenon of geomantic omen and so on. There are many such fortune tellers who need to know each other's date of birth before they can infer the fate of this person's life. Fate is like a tree (in general).

But it is worth noting that fortune telling is a breakthrough, which will have a great influence on fortune tellers. Therefore, fortune tellers are generally disabled (with a little physical defect) or holding incense tables at home! It will also express people's major events implicitly! That's indirect!