"You have to believe in yourself."

Translation: 你要相信你自己。

[KX3.]

”你要相信自己“才是没语病的句子吧

[PeaceJoyPancakes]

Are you saying that "你要相信你自己" is grammatically incorrect?

I like your version, but I would have though it was okay with or without the second "你". Certainly "你自己" itself is an extremely common phrase, as far as I can tell.

[KX3.]

Yes, it is technically incorrect but definitely commonly used. Many 语病 has its source in commonly used phrases, actually.

[RobinThor]

Why is 你需要相信你自己 wrong?

[Galeos1]

It's a bit redundant I guess? Tho I wouldn't mark it wrong, it reads more of you need to believe in yourself (which is stronger in nature)

[KamiAithein]

“你要自己相信”？

[PeaceJoyPancakes]

No. That's "You yourself have to believe". (I.e., it's not enough for others to believe.)

But a close approximation is perhaps "你要有自信（心）", "You have to have self-confidence". Native speakers, is this correct?