Believe in yourself, or you'll never succeed.

相信自己，否则你永远不会成功。

I ask you to believe in yourself and your mission.

我请求你们相信自己和自己的使命。

If you believe in yourself you can succeed.

对自己有信心，你就能成功。

You have to believe in yourself.

你必须相信你自己。

If you believe in yourself, you can succeed.

只要自信，就能成功。