According to William James, there are multiple dimensions of the self, with two levels of hierarchy:
1. the processes of knowing, called the 'I-self', and
2. the resulting knowledge about the self, called the 'Me-self’
The "Me" can be thought of as a separate object or individual a person refers to when describing their personal experiences, while the "I" is the self that knows who they are and what they have done in their life.
For James, the "I" part of self was the thinking self, which could not be further divided. He linked this part of the self to the soul of a person, or what is now thought of as the mind.
The self-concept is that what we think about the self; self-esteem, is the positive or negative evaluations of the self, as in how we feel about it. Self-esteem is regarded as: self-confidence, self-worth, self-regard, self-respect, self-integrity and so on.