and the most important thing is to believe——?填什么

And the most important thing is to believe in yourself。最重要的事是相信自己。（一般是这样的）不过还可以 +in 和一个the名字（包括人称）EG。And the most important thing is to believe in the Queen。（相信女皇）And the most important thing is to believe in the truth。(相信真理）