A: Without language thought would be impossible.
B: Without language thought is impossible. (I saw this sentence in a certain book)
I think A is correct, and it expresses that we humans do have language now, but if we should have no language at all, thought would be impossible.
But I' m not so sure about B. Maybe B expresses generally that if we humans have language we can think, and if not we can't think.
But we humans do have language, so I think we can't state B.
Am I right?