self-assurance

She spoke with such self-assurance that everyone believed her plan would succeed.

她说话时如此自信，以至于每个人都相信她的计划会成功。

His self-assurance grew after he received positive feedback on his presentation.

在收到对他演示的积极反馈后，他的自信增强了。

It takes a lot of self-assurance to stand up and disagree with the majority.

站出来反对多数人需要极大的自信。