We have to winnow out and punish these foolish ideas.
It is a foolish idea, no doubt, but it passes the time pleasantly.
It's time to put away those foolish ideas.
This is certainly a foolish idea, and we needn't mention it anymore.
perhaps the most obvious reason why foolish ideas persist is that someone has an interest in defending or promoting them.
It's time to put away those foolish ideas and become serious.
This is foolish idea, no doubt, so we'll say no more about it.
Put away those foolish ideas!
I had a foolish idea that I wanted to live forever, not because I was greedy, but because I missed it.
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