In the case of a mirage, we can study heat, radiation, light, and even people's sense that they are perceiving water, but there is no water. Similarly, for Spinoza, there is no prophecy in the Hebrew Bible. It is also a phantom. The study of 'real' prophecy as he defines it is epistemology, the science of how we know things. And if the Hebrew Bible contains any miraculous revelation, such as the Golden Rule, its miraculous nature precludes its being an object of rational analysis.