Quote from : The History of Rasselas, Prince of Abissinia Book

Pleasure, in itself harmless, may become mischievous, by endearing to us a state which we know to be transient and probatory, and withdrawing our thoughts from that of which every hour brings us nearer to the beginning, and of which no length of time will bring us to the end. Mortification is not virtuous in itself, nor has any other use, but that it disengages us from the allurements of sense. In the state of future perfection, to which we all aspire, there will be pleasure without danger, and security without restraint.