The aim of the list was to protect the belief and morals of the faithful. This was done by preventing them from reading [[heresy|heretical]] and [[morality|immoral]] books. Books thought to contain such errors included works by [[astronomers]] such as [[Johannes Kepler]]'s ''Epitome astronomiae Copernicanae'', which was on the Index from 1621 to 1835, and by philosophers, like [[Immanuel Kant]]'s ''[[Critique of Pure Reason]]''. The various editions of the ''Index'' also had the rules of the Church about the reading, selling and censorship of books. Even editions and [[Bible translations|translations of the Bible]] not been approved by the Church could be banned.<ref>''Index Librorum Prohibitorum'', 1559, Regula Quarta ("Rule 4")</ref> | The aim of the list was to protect the belief and morals of the faithful. This was done by preventing them from reading [[heresy|heretical]] and [[morality|immoral]] books. Books thought to contain such errors included works by [[astronomers]] such as [[Johannes Kepler]]'s ''Epitome astronomiae Copernicanae'', which was on the Index from 1621 to 1835, and by philosophers, like [[Immanuel Kant]]'s ''[[Critique of Pure Reason]]''. The various editions of the ''Index'' also had the rules of the Church about the reading, selling and censorship of books. Even editions and [[Bible translations|translations of the Bible]] not been approved by the Church could be banned.<ref>''Index Librorum Prohibitorum'', 1559, Regula Quarta ("Rule 4")</ref> |