The commonest means which the ascetic and saint employs to render life still endurable and amusing consists in occasional warfare with alternate victory and defeat. For this he requires an opponent, and finds it in the so-called "inward enemy." He principally makes use of his inclination to vanity, love of honour and rule, and of his sensual desires, that he may be permitted to regard his life as a perpetual battle and himself as a battlefield upon which good and evil spirits strive with alternating success. It is well known that sensual imagination is moderated, indeed almost dispelled, by regular sexual intercourse, whereas, on the contrary, it is rendered unfettered and wild by abstinence or irregularity. The imagination of many Christian saints was filthy to an extraordinary degree; by virtue of those theories that these desires were actual demons raging within them they did not feel themselves to be too responsible; to this feeling we owe the very instructive frankness of their self-confessions. It was to their interest that this strife should always be maintained in one degree or another, because, as we have already said, their empty life was thereby entertained. But in order that the strife might seem sufficiently important and arouse the enduring sympathy and admiration of non-saints, it was necessary that sensuality should be ever more reviled and branded, the danger of eternal damnation was so tightly bound up with these things that it is highly probable that for whole centuries Christians generated children with a bad conscience, wherewith humanity has certainly suffered a great injury. And yet here truth is all topsy-turvy, which is particularly unsuitable for truth. Certainly Christianity had said that every man is conceived and born in sin, and in the insupportable superlative-Christianity of Calderon this thought again appears, tied up and twisted, as the most distorted paradox there is, in the well-known lines-- "The greatest sin of man Is that he was ever born."