I buy from China as part of my job and we usually either buy in Hong Kong dollars, US dollars or RMB and dump the RMB as soon as possible. One of the reasons that HK exists in its current form is to allow us to easily dump RMB.
Just as a heads up, this statement is often used as an anti-Semitic canard. You obviously didn’t mean it in that context, but you may want to use that quotation with caution.
This can only become partly true if you're using a definition of "free" that's so broad, it becomes meaningless. Even then, we all live in societies that preclude us from choosing to do certain things. In the US, I can't buy anything from North Korea, for example.
The quote is a truism but what is the source? Google brings up a very limited, maybe filtered, list of results. Orwell, Voltaire, a white supremacist? I don't really care which. Just curious about the historical origin.
So in the end, the thing that rules over you is actually money.