But real confidence is quiet. It has no need for attention. It attends to itself.

但是真正的自信是安静的，不需要别人的关注，只关注自身。

youdao

You reflect quiet confidence in your abilities when you smile and let your boss or team take the credit for your work.

那种有能力做好事情时，脸上所流露出的自信的微笑，会帮你取得老板，搭档的信任。

youdao

The Center for Security Policy commends Japan for reacting with quiet confidence to this Russian diplomatic power-play.

CENTERFORSECURITYPOLICY: Center For Security Policy

There are no brash predictions for London just a quiet layer of confidence.

WSJ: Evelyn Stevens Gets an Assist From Connie Carpenter: Cycling's Luke Finds Her Obi-Wan -- London 2012