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The Lord gave the keys of heaven to Saint Peter. What is a sin and what is for saint Peter to say, not Aquinas. What is mortal or venial or a temptation is for Saint Peter to say, not Tom.
NO ONE ELSE will the Paraclete give divine revelations. The Greek text of the gospel uses the SINGLAR form of you, not the plural. Protestants lie about this to lead people to hell. ONLY Saint Peter and his true successors holds the keys.