I will do somebody a good tum and not get found out: If anybody knows of it, it will not count.

我会做对某人有利的事但不能被发现，若有人发现了就不算数。

youdao

Just for today I will exercise my soul in three ways. I will do somebody a good turn and not get found out If anybody knows of it, it will not count.

就为了今天，我会用三种方法来磨炼我的灵魂，我会做对某人有利的事但不能被发现，弱有人发现了就不算数。

youdao

I will do somebody a good turn and not get found out: If anybody knows of it, it will not count.

我会帮助某人完成一个好的转变，而且不被发现：如果某人知晓，这将不值得一提。

youdao