"We speak of a person being “under the influence” of alcohol, or heroin, or amphetamine, and believe that these substances affect him so profoundly as to render him utterly helpless in their grip. We thus consider it scientifically justified to take the most stringent precautions against these things and often prohibit their nonmedical, or even their medical, use. But a person may be under the influence not only of material substances but also of spiritual ideas and sentiments, such as patriotism, Catholicism, or Communism. But we are not afraid of these influences, and believe that each person is, or ought to be, capable of fending for himself."