But man hath perversely continued to serve his lustful appetites . . . With this, and with the perpetrating of vile and ignoble acts, his attention was engrossed, and he abandoned the temperance and moderation of a natural way of life. The result was the engendering of diseases both violent and diverse.

‘Abdu’l-Bahá, Selections from the Writings of ‘Abdu’l-Bahá, pp. 152-153