“Those that can...DO, those that can't....HATE”
“Those who can do, those who can't teach.”
“Those who can -- do. Those who can't -- teach.”
“To my mind, those who can, do. Those who can't, gripe.”
“Those who can, do; those who can't learn classification and cataloguing.”
“Hate is such a strong emotion. Much more powerful than indifference. But those who burn with hate can also love just as intensely. Can't they? When you hate--or love--do you do so with all your heart? So much that it feels as if you might die from it?”