In order to be confident in yourself, you must understand and have experienced the nature of failure.

为了获得自信，你一定要懂得并体验失败的本质，因为没有失败你就不能理解什么是成功。

youdao

Remember that smiling is a choice not a result, and be confident in yourself, decide for yourself, learn for yourself and be yourself.

记住，微笑是选择而非结果，要自信，要自己决定，要为自己学习，要做自己。

youdao

You should be confident in yourself and do not give up easily when you meet with difficulty. You should change difficulty into challenges and face them bravely.

你应该更多的自信，不轻易放弃，当你遇到困难你应该改变困难的挑战，面对他们勇敢地进入。

youdao

If you put yourself in the hands of someone who knows what they are doing, you can be confident it will look good.

WSJ: 20 Odd Questions: Nicky Haslam