Sometimes it becomes physically impossible to preach, for example when one becomes physically debilitated, pregnant, elderly or mentally infirm. But the prescription for a true follower of Srila Prabhupada is to always be, somehow or other, in the “spirit of preaching,” as opposed to the “spirit of enjoyment.” In The Transcendental Teachings of Prahlada Maharaja (taken from lectures by Srila Prabhupada) it is written: “The spirit of enjoyment is present in its pure form in the spiritual world, in relation to Krsna, but we have come here to partake of contaminated enjoyment, just as a man on the Bowery thinks he can enjoy by drinking some liquor. The basic principle of material enjoyment is sex. Therefore, you will find sex not only in human society but in cat society, dog society, bird society-everywhere. During the daytime, a pigeon has sex at least twenty times. This is his enjoyment.”