I mean it

A phrase that emphasizes sincerity or seriousness, signaling that what precedes it should be taken literally rather than as exaggeration, politeness, or empty talk.

Often follows a statement the speaker worries might be dismissed: You need to see a doctor—I mean it.

Can accompany threats, promises, or compliments to underscore genuine intent: I mean it, this is your last warning.

Sometimes stands alone as confirmation when challenged: Do you really think I'm talented? —I mean it.