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One example would be that of Limbo. Regarded less in this century then in the past, there are refrences to the state of Limbo from the early fathers and the idea has not been completely abolished. I might suggest also the age of the earth itself, Catholics are free to beleive as many Young Earth Creationist do, that the earth is only 7000 years old ish. Regardless of what God has revealed to us about the true age of his creation through science. So the Idea, which most regard as non-sence is a tolerated opinion as it has no bearing on the faith or teachings of the Church.