Clive Staples Lewis (1898–1963) is an outstanding British writer, author of the famous Chronicles of Narnia series, the total circulation of which exceeded 100 million copies. However, Lewis is also widely known as the author of philosophical works on Christianity, which largely reflected his personal religious experience. In his teens, Lewis abandoned the faith under the influence of the atheistic views of his teacher, but by the age of 30, now under the influence of his university environment and one of his best friends, John R.R. Tolkien, converted back to the Anglican faith. Towards the end of his life, he began to lean towards Catholicism and took his last communion according to the Catholic rite. The collection includes three of Lewis's classic works on Christian apologetics - Mere Christianity, Love and Suffering. Clive Staples Lewis was one of the first Christian philosophers of the 20th century to put forward the bold idea of “ecumenical Christianity”, not associated with a particular denominational affiliation. True faith has nothing to do with the disagreements of different branches of Christianity, and this, according to Lewis, is the essence of “mere Christianity.”