A wise girl knows her limits, a smart girl knows that she has none.

The line contrasts two kinds of self-knowledge: “wise” as prudence and acceptance of constraints, versus “smart” as audacious self-belief that refuses externally imposed ceilings. Read as a piece of empowerment rhetoric, it suggests that social “limits” (especially for women) are often constructed and can be transcended through confidence and ambition. At the same time, the aphorism is intentionally paradoxical—claiming to have “no limits” is not literally true, but functions as a motivational stance: act as if boundaries are negotiable. Its popularity today fits modern self-help and feminist quotation culture more than Monroe’s documented voice, which makes attribution worth treating cautiously.