Do thoughts have any language?

You should understand that the language we use here is thought language.

A Russian and an Englishman can speak freely together provided only that their level of development is the same, not only their intellectual education, but their spiritual knowledge.

There are many instances of thought transference known among you and they are simply examples of our common manner of communicating here. 

Now you can learn much of that language. You already know much more of it than you realise.

―William James in Spirit