「気になる」跟「気にする」到底誰是主動、誰是被動？

Question

「気になる」＝在意（自動詞，好像事情自己浮現在腦海）；「気にする」＝介意（他動詞，感覺是主詞主動去在意）。所以「彼の言葉が気になる」跟「彼の言葉を気にする」這兩句實際使用起來，語感真的差很多嗎？還是幾乎可以互換？

Accepted Answer

気になる is closer to 'it's nagging at me' — the thought intrudes involuntarily, almost against your will, which is why it's intransitive (が). 気にする is closer to 'I'm choosing to dwell on it / let it bother me' — there's a whiff of agency, and it's often used in the negative as advice: 気にしないで('don't let it bother you', i.e. stop actively dwelling on it). You couldn't naturally say 気になるな as advice in the same way, because 気になる isn't framed as something the listener controls.