When we see 2 things always together–bread and cheese, Abbot and Costello, writing and language, mind and brain–that is precisely a proof that they are NOT the same. That’s why the old Private Eye joke–“Has anyone seen them together? I think we should be told”–works.
No carriage without a horse. But the horse is not a carriage.
No flying without an engine. But the engine is not a plane.
No mind without a brain. But–