In his encyclical on Faith and Reason, Pope John Paul says the following in #4.
…Once reason successfully intuits and formulates the first universal principles of being and correctly draws from them conclusions which are coherent both logically and ethically, then it may be called right reason or, as the ancients called it, orthós logos, recta ratio .
“Reason” is our ability to think, rationalize, reach conclusions, etc.
“Right reason” therefore is thinking and reasoning correctly - logically, ethically. For a Catholic that means reaching and accepting conclusions in our thinking that are in accord with Our Lord’s teaching and the teachings of the Church He established.
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