The secret has always been you are the message.请问下这个句子是什么语法.

这是该句子出自的段落：
You are the message.For 25 years I've worked with thousands who want to be successful.I've helped them make persuasive presentations,answer unfriendly questions,communicate more effectively.The secret has always been you are the message.
该句翻译为：所有这一切的秘诀都在于要懂得你本人就是信息.
你需要把“that you are the message”单独看做一个宾语.这里that无意义,可以省略

这是宾语从句，语法很简单的：the secret has been (that) you are... 这里的that 在大部分情况下可以省略的。

（that）you are the message 是表语从句，说明主语。
The secret has always been you are the message.
此句中并无及物动词，何来“宾语从句”？