Providence has fixed the limits of human enjoyment by immoveable boundaries, and has set different gratifications at such a distance from each other, that no art or power can bring them together. This great law it is the business of every rational being to understand, that life may not pass away in an attempt to make contradictions consistent, to combine opposite qualities, and to unite things which the nature of their being must always keep asunder. Of two objects tempting at a distance on contrary sides, it is impossible to approach one but by receding from the other; by long deliberation and dilatory projects, they may be both lost, but can never be both gained. It is, therefore, necessary to compare them, and, when we have determined the preference, to withdraw our eyes and our thoughts at once from that which reason directs us to reject. This is more necessary, if that which we are forsaking has the power of delighting the senses, or firing the fancy. He that once turns aside to the allurements of unlawful pleasure, can have no security that he shall ever regain the paths of virtue. The philosophick goddess of Boethius, having related the story of Orpheus, who, when he had recovered his wife from the dominions of death, lost her again by looking back upon her in the confines of light, concludes with a very elegant and forcible application. "Whoever you are that endeavour to elevate your minds to the illuminations of Heaven, consider yourselves as represented in this fable; for he that is once so far overcome as to turn back his eyes towards the infernal caverns, loses at the first sight all that influence which attracted him on high:" Vos haec fabula respicit, Quicunque in superum diem Mentem ducere quaeritis. Nam qui Tartareum in specus Victus lumina flexerit, Quidquid praecipuum trahit, Perdit, dum videt inferos. It may be observed, in general, that the future is purchased by the present. It is not possible to secure instant or permanent happiness but by the forbearance of some immediate gratification. This is so evidently true with regard to the whole of our existence, that all the precepts of theology have no other tendency than to enforce a life of faith; a life regulated not by our senses but our belief; a life in which pleasures are to be refused for fear of invisible punishments, and calamities sometimes to be sought, and always endured, in hope of rewards that shall be obtained in another state. Even if we take into our view only that particle of our duration which is terminated by the grave, it will be found that we cannot enjoy one part of life beyond the common limitations of pleasure, but by anticipating some of the satisfaction which should exhilarate the following years. The heat of youth may spread happiness into wild luxuriance, but the radical vigour requisite to make it perennial is exhausted, and all that can be hoped afterwards is languor and sterility.