"THERE are two ways, O Emperor Constantine, by which human life must proceed—the one which leads to heaven, the other which sinks to hell; and these ways poets have introduced in their poems, and philosophers in their disputations. And indeed philosophers have represented the one as belonging to virtues, the other to vices; and they have represented that which belongs to virtues as steep and rugged at the first entrance, in which if any one, having overcome the difficulty, has climbed to the summit, they say that he afterwards has a level path, a bright and pleasant plain, and that he enjoys abundant and delightful fruits of his labours; but that those whom the difficulty of the first approach has deterred, glide and turn aside into the way of vices, which at its first entrance appears to be pleasant and much more beaten, but afterwards, when they have advanced in it a little further, that the appearance of its pleasantness is withdrawn, and that there arises a steep way, now rough with stones, now overspread with thorns, now interrupted by deep waters or violent with torrents, so that they must be in difficulty, hesitate, slip about, and fall. And all these things are brought forward that it may appear that there are very great labours in undertaking virtues, but that when they are gained there are the greatest advantages, and firm and incorruptible pleasures; but that vices ensnare the minds of men with certain natural blandishments, and lead them captivated by the appearance of empty pleasures to bitter griefs and miseries—an altogether wise discussion, if they knew the forms and limits of the virtues themselves. For they had not learned either what they are, or what reward awaits them from God: but this we will show in these two books."
~Lactantius (c. 250 – c. 325): The Divine Institutes, Bk. VI, Ch. 6.