There are many people who are not entirely themselves because as children they were not given time to think about themselves. And because they don’t know everything about themselves they can’t know everything about everything. But no one likes to admit that she doesn’t know everything about everything. And so these people try to make up for not knowing everything about everything by doing things.
People who for some reason find it impossible to think about themselves, and so really be themselves, try to make up for not thinking with doing. They try to pretend that doing is thinking.