Suppose you have an eye problem. Your friend tries to help you. He says, “Try these glasses. I have worn ①them for ten years, and they really helped. I have another pair of glasses at home. I can wear ②them.”

You try ③them, but it is worse now. You say, “Oh, I don’t think these work for me. I can’t see anything.”

Your friend says, “Why not? They worked well for me. Try ④them again.”

“I am wearing ⑤them, but I can’t see things,” you say. Your friend says, “You are unthankful.” What do you think of your friend?