Rather complicated but...
He who knows and knows that he knows, is a leader, follow him.
He who knows and knows not that he knows, is a student, teach him.
He who knows not and knows that he knows not, is a man, befriend him.
He who knows not and knows not that he knows not, is a fool, ignore him.
And another...
Bread is the staff of life...That does not mean that the life of the staff is one big loaf.
Cheers, Bobj.