Before the invention of language, it was possible for a human being to think without language. After the invention of language, that is no longer possible. It's like distinguishing balance. Under normal circumstances, once you learned to walk or ride a bike, those things cannot be unlearned. If you're hurt, or ill, you might lose the higher cognitive functions that allow for use of language. However, I'm responding as though we are talking about normal, functioning human beings.
However, we can learn to use language for our own advantage rather than be trapped or "bewitched" by it. We can learn to think freely, in spite of the limitations of language. The problem is that although we can't think withiout language, language is limited in it's ability to describe the full range of the experience of what it is to be human. (to say that another way: even though there is experience beyond what language can describe, that does not mean we can think without language). What it does mean is that we tend to assume that what languague cannot describe, doesn't exist. And that's the bewitching part. Language blinds us to the truth of our existence. We begin to think that what has been, or is being described by our thinking is all there is. Overcoming the bewitchment, means being open to the possibility that something else, something beyond what we have thought, is possible, even if we have no knowledge of what that is.