I’m not an expert on Eastern Philosophy but I would say that Eastern tradition discusses the idea of no-self––as in the self is an illusion. Now, this doesn’t mean there’s nothing have thoughts or thinking.
For example, we can say that the mind is purely material, it’s part of nature, where this idea of a spiritual “self” that is separate from the body is an illusion. However, this doesn’t mean we can’t understand anything about the universe. Essentially, philosophy is still useful! I’ve oversimplified but for the sake of time, I hope this makes sense.