英语好的朋友，帮下忙

英文口语里面较少这么诗意的表达。你这句话在日常口语中我觉得最常用的就是：
I don't want to talk anymore.表示我不想说什么了。
你这句话可以直译：Nothing is the only thing I want to talk about.但是这样的表达不太常见。

我不是专门学英语的，主修英语文学的人应该能有更书面语的答案。

Nothing is the only thing I want to say.
The only thing I want to say is nothing
What I only want to say is nil.
I only want to say nothing.
Nothing to say is what I want to say.

以上随便哪一句都能表达你想说的意思。

让我想起了电影里的一句话：i have a dream is to have a dream.

呵呵 我的翻译：the only thing i want to say is that there's nothing more to be talked about.

In daily English, you simply say

I'm speechless

The only thing I want to say is nothing to say

Nothing is all I'm going to say.