You see the problem is this.. We have a certain number of actions we define as voluntary and we feel in control of those, then over against that all of those things that are involuntary. But the dividing line between these two is very arbitrary. Because for example, when you move your hand you feel that you decide whether to open it or to close it, but then ask yourself how do you decide? When you decide to open your hand do you first decide to decide? You don’t do you? You just decide, and how do yo do that? And if you don’t know how you do it, is it voluntary or involuntary? So we come to have a very arbitrary definition of self.
— Alan Watts