An unseen essay by famed author C.S. Lewis is to be published for the first time.

The piece, in which The Lion, the Witch and the Wardrobe writer outlines his thoughts on God and the nature of truth, was rescued from a bonfire following Lewis' death in 1963.

It is to be published next week (beg25Nov13) to mark the 50th anniversary of his passing on 22 November (13).

The essay was among a bundle of papers Lewis' brother Warren had earmarked for burning which were saved by the writer's secretary, Walter Hooper.

He says, "Warren was moving to a smaller place, so he began burning up the family papers. He loved his brother dearly, but he wasn't interested in anything except things of a family nature."