He who knows not and knows not he knows not, he is a fool.
Shun him.
He who knows not and knows he knows not, he is simple.
Teach him.
He who knows and knows not he knows, he is asleep.
Wake him.
He who knows and knows he knows, he is wise.
Follow him.
Those parts of the system that you can hit with a hammer (not advised) are called hardware; those program instructions that you can only curse at are called software. ~Author Unknown