The man who knows not
But knows not that he knows not
Is a fool ....Shun him~
The man who knows not
And knows he knows not
Is a student ...... teach him~
The man who knows
But knows not that he knows
Is asleep ..... awaken him~
But the man who knows
And knows that he knows
Is a teacher.......Learn from him~

AUTHOR UNKNOWN ..
I came across this as a young man
and have kept it since ..