This book is meant to be a companion to "Heretics," and to put the positive side in addition to the negative. Many critics complained of the book called "Heretics" because it merely criticised current philosophies without offering any alternative philosophy. This book is an attempt to answer the challenge. It is unavoidably affirmative and therefore unavoidably autobiographical. The writer has been driven back upon somewhat the same difficulty as that which beset Newman in writing his Apologia; he has been forced to be egotistical only in order to be sincere. While everything else may be different the motive in both cases is the same. It is the purpose of the writer to attempt an explanation, not of whether the Christian Faith can be believed, but of how he personally has come to believe it. The book is therefore arranged upon the positive principle of a riddle and its answer. It deals first with all the writer's own solitary and sincere speculations and then with all the startling style in which they were all suddenly satisfied by the Christian Theology. The writer regards it as amounting to a convincing creed. But if it is not that it is at least a repeated and surprising coincidence.
Gilbert K. Chesterton

Gilbert Keith Chesterton, (29 May 1874 - 14 June 1936), was an English writer, poet, philosopher, dramatist, journalist, orator, lay theologian, biographer, and literary and art critic. Chesterton is often referred to as the "prince of paradox".Time magazine has observed of his writing style: "Whenever possible Chesterton made his points with popular sayings, proverbs, allegories-first carefully turning them inside out.
Chesterton is well known for his fictional priest-detective Father Brown,[5] and for his reasoned apologetics. Even some of those who disagree with him have recognised the wide appeal of such works as Orthodoxy and The Everlasting Man.[4][6] Chesterton routinely referred to himself as an "orthodox" Christian, and came to identify this position more and more with Catholicism, eventually converting to Catholicism from High Church Anglicanism. George Bernard Shaw, his "friendly enemy", said of him, "He was a man of colossal genius."[4] Biographers have identified him as a successor to such Victorian authors as Matthew Arnold, Thomas Carlyle, Cardinal John Henry Newman, and John Ruskin.
Chesterton was born in Campden Hill in Kensington, London, the son of Marie Louise, née Grosjean, and Edward Chesterton.[8][9] He was baptised at the age of one month into the Church of England,[10] though his family themselves were irregularly practising Unitarians.[11]According to his autobiography, as a young man Chesterton became fascinated with the occultand, along with his brother Cecil, experimented with Ouija boards.
Chesterton was educated at St Paul's School, then attended the Slade School of Art to become an illustrator. The Slade is a department of University College London, where Chesterton also took classes in literature, but did not complete a degree in either subject.