This is not my favourite book by Lewis, who is my favourite author, but it's full of his well reasoned arguments on a number of big issues, namely pacifism, capital punishment and religion V relationship. Timeless at Heart is a collection of letters so it lacks coherence and despite the efforts of the editor, also lacks some context. Lewis' writing can be hard to read, but this one in particular in places was a bit too dense for me.
Naturally, the book is riddled with superb nuggets of wisdom which is why I love his writing. Overall, just a bit too heavy, but worth a read nonetheless.