The term 'self-centered ones' can refer to two different types of people: egoists and egotists. An egoist is someone who is excessively concerned with their own interests and desires, often disregarding the needs of others. An egotist is someone who is overly self-important and boastful, believing themselves to be superior to others. Both egoists and egotists are focused on themselves and their own needs, making them self-centered.