Jonathan Donihue

“There is tremendous stress these days on liking people, helping people, getting along with people, as qualifications for a manager. These alone are never enough. In every successful organization there are bosses who do not like people, who do not help them, and who do not get along with them. Cold, unpleasant, demanding, they often teach and develop more people than anyone else. They command more respect than the most likable person ever could. They demand exacting workmanship of themselves and other people. They set high standards and expect that they will be lived up to. They consider only what is right and never who is right. And though often themselves persons of brilliance, they never rate intellectual brilliance above integrity in others. The manager who lacks these qualities of character—no matter how likable, helpful, or amiable, no matter, even, how competent or brilliant—is a menace who is unfit to be a manager.”
― Peter F. Drucker, Management, Revised Edition