To the untutored sage, the concentration of population was the prolific mother of all evils, moral no less than physical. He argued that food is good, while surfeit kills; that love is good, but lust destroys; and not less dreaded than the pestilence following upon crowded and unsanitary dwellings was the loss of spiritual power inseparable from too close contact with one’s fellow-men.

The logical man must either deny all miracles or none.