"The relation between physical sanitary laws and the national welfare is now hardly disputed. At this moment the cholera is stealthily feeling its terrible way along the edges of Europe to this country, and there is not an intelligent man who does not know that it is a divine vengeance upon uncleanliness. Let it seize the unclean city of New York, and it will riot in horror and devastation. Panic will empty the palaces, trade will stop in the warehouses. Those who can will flee, while the poor and wretched, poisoned in tenement-houses, will be huddled in heaps of agony and death. Does any man say that cholera is God's remedy for overpopulation? On the contrary, it is only the ghastly proof that God's laws of human health are disregarded. It is not a proclamation that the world is over-peopled; it is merely a warning for the world to provide decently for its population. God does not create men in his image to rot in tenement-houses, and he will make squalor and filth and misery plague-spots threatening the fairest prosperity, until that prosperity acknowledges in vast sanitary reforms that cleanliness is next to godliness. And if the dread pestilence now approaching our shores would frighten us into universal purgation of our foul cities, it would be seen at this moment hovering in the wintry air, not an angry demon, but a stem angel with a sword of fire to open the path of knowledge and humanity and civilization."