Watch it well, therefore; suspect and challenge all outsiders who come near it.

Keep the passes that lead to your heart with all diligence.

Let nothing contraband, let nothing that even looks suspicious, ever enter your hearts; for, if it once enters, and turns out to be evil, you will never get it all out again as long as you live.

'Death is come up into our windows,' says our prophet in another place, 'and is entered into our palaces, to cut off our children in our houses and our young men in our streets.' Make a covenant, then, with your eyes.

Take an oath of your eyes as to which way they are henceforth to look.