The fortune teller said that I should be careful in August and September this year. What does it mean to say that this stage is like a lamp on a high mountain?

Probably a liar. Because I can't recite sixty-four hexagrams now, if you can still find him, you can ask him which hexagrams he said, and I can give you the answer only after asking clearly. The reason why he may be a liar is because what he usually tells people is like, because people don't understand, so they have to explain. If you don't explain anything, it is probably mysterious. Of course, it may be that people want your money and don't want to tell you the secret, or it may be.