Hi Viky, I just finished reading the book “Think and Grow Rich”.
In relation to the book, “ether” is referring to some form of spiritual world, something that is so surreal and out of this world.
In the book, its used in the context that you think about your success long enough that you start speaking it into the universe, and the universe rewards you with just that.
So in essence the “ether” is closely related to the universe. It’s like a kind of heaven.