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wishful thinking 甘い考え、願望的思考、

That's your wishful thinking. それは考えが甘い

"You know what my least favorite John Lennon song is?" he says. "Imagine. At the root of it is some rigorous thinking about the way things could be, but people have stolen the idea and made it an anthem for wishful thinking. I'm against wishful thinking. I hate it."