(23) This may be illustrated by the following anecdote: A certain scavenger went into the perfume sellers' bazaar, and, smelling the sweet scents, fell down unconscious. People came round him and sprinkled rose-water upon him and held musk to his nose, but he only became worse. At last one came who had been a scavenger himself; he held a little filth under the man's nose and he revived instantly, exclaiming, with a sigh of satisfaction, "Ah! this is perfume indeed!" Thus in the next life a worlding will no longer find the filthy lucre and the filthy pleasures of the world; the spiritual joys of that world will be altogether alien to him and but increase his wretchedness. For the next world is a world of Spirit and of the manifestation of the Beauty of God; happy is that man who has aimed at and acquired affinity with it. All austerities, devotions, studies have the acquirement of that affinity for their aim, and that affinity is love. This is the meaning of that saying of the Koran, "He who has purified his soul is happy." Sins and lusts directly oppose the attainment of this affinity; therefore the Koran goes on to say, "and he who has corrupted his soul is miserable." Those who are gifted with spiritual insight have really grasped this truth as a fact of experience, and not a merely traditional maxim. Their clear perception of it leads them to the conviction that he by whom it was spoken was a prophet indeed, just as a man who has studied medicine knows when he is listening to a physician. This is a kind of certainty which requires no support from miracles such as the conversion of a rod into a snake, the credit of which may be shaken by apparently equally extraordinary miracles performed by magicians.