If the government simply prohibits these four things—meat-eating and drinking, gambling and illicit sex—the whole country will change, immediately.

All sinful activity. Ugra-karma. And if you drink wine, then you must require meat. Otherwise your liver function will be bad. There must be lump of meat. And as soon as wine and meat combine, then you require illicit sex. It is one after another. This is scientific. So we stop immediately: "Stop these four principles." Then one will be free from sinful life. Then he'll understand what is God. Otherwise not possible. A sinful man cannot understand what is God. Why the whole world is godless? On account of the sinful life, they cannot understand.

Srila Prabhupada — November 21, 1975, Bombay