Francis, who has won praise for spontaneous and unusual moves during his six month papacy, wrote a lengthy letter to a newspaper, La Repubblica, which the Italian daily printed over four pages, including page one, under the simple byline “Francesco”. …

The 76-year-old pontiff was responding to editorials written in July and August by Eugenio Scalfari, an agnostic and the paper’s founder, in which he was asked whether “the Christian God forgives those who do not believe and do not seek faith”. …

The Pope wrote: “The question for those who do not believe in God is to follow their own conscience. Sin, even for a non-believer, is when one goes against one’s conscience.

“To listen and to follow your conscience means that you understand the difference between good and evil.”