For many a year men have been discussing, arguing, enquiring about certain great basic truths-about the existence and the nature of God, about His relation to man, and about the past and future of humanity. So radically have they differed upon these points, and so bitterly have they assailed and ridi¬culed one another's beliefs, that there has come to be a firmly-rooted popular opinion that with regard to all these matters there is no certainty available-nothing but vague speculation amid a cloud of unsound deductions drawn from ill-established premises. And this in spite of the very definite, though fre¬quently incredible, assertions made on these subjects on behalf of the various religions.