inner self

This term carries a strong psychological and spiritual connotation, often appearing in contexts related to mindfulness, psychoanalysis, or personal growth. It suggests a duality between the public persona—the mask worn for social convenience—and a hidden, authentic core. Because it refers to a singular, metaphysical essence, it is rarely used in a plural sense.

In a pragmatic sense, the phrase is frequently used to describe a state of introspection or a quest for authenticity. It is more common in therapeutic or philosophical registers than in casual daily conversation, where terms like "true self" or "private life" might be used instead.