it's good advice to tell yourself that "I'm the kind of person who does X." We can shift/expand our identities about ourselves to build better habits. It's like

it's good advice to tell yourself that "I'm the kind of person who does X." We can shift/expand our identities about ourselves to build better habits. It's like, to quit smoking, we must remind ourselves that "I'm not a smoker/ a person who smokes anymore."