It's not all in the Mind

Sometimes, I hear people say, "it's all in the mind." "You can do anything if you put your mind to it." This is often used for normal people.

But then there are people who have deficiencies in their mental functions. For example, autistics. These people are unable to think as well as "normal" people do. You know about manic-depressives, amnesiacs, Down's Syndrome and other kinds of people. These are real, and as the mental health professions proves, mental illnesses affecting the physical part of the brain do affect the behavior of people. Behavior is not entirely controlled by willpower only.