"Becoming a Critic of Your Thinking" by Richard Paul and Linda Elder
"There is nothing more practical than sound thinking. No matter what your circumstance or goals, no matter where you are, or what problems you face, you are better off if your thinking is skilled. As a manager, leader, employee, citizen, lover, friend, parent — in every realm and situation of your life — good thinking pays off. Poor thinking, in turn, inevitably causes problems, wastes time and energy, engenders frustration and pain."