The ego is the mind that misunderstands the nature of the I. We generally feel that the I exists somewhere vaguely within the body. To gain a correct picture of reality, it is necessary to investigate deeply and try to find out exactly where this I resides. When we make a thorough search for our self, looking throughout our entire body and nervous system, we can never find it. Sometimes we may think we have located it, but upon closer examination we can see that we have been deceived.
–Lama Thubten Yeshe