expression
keep calm; don't do anything rash; stay composed
A polite, somewhat formal set phrase used to encourage someone who is upset or panicking to stay calm and not act impulsively. Often used when consoling or warning someone in distress.
そんなに慌てないで、お気を確かに。
Don't panic like that; keep calm.
お気を確かに。今は冷静になることが大切です。
Stay composed. It's important to stay calm right now.