Knowing

I was googling a random song lyric and came across this blog post, which led me to this.

He that knows not,
    and knows not that he knows not
        is a fool.
            Shun him

He that knows not,
    and knows  that he knows not
        is a pupil.
            Teach him.

He that knows,
    and knows not that he knows
        is asleep
            Wake him.

He that knows,
    and knows that he knows
        is a teacher.
            Follow him.

            (Arabic proverb)