 Here Cavendish is allowing that for all we know there exist immaterial entities like a divine and supernatural soul, but if so, we do not detect any such entities, and they are not the things that we are referencing when we talk about the minds by which we think and have ideas. Those interact with bodies, and partake of motion, and hence they are material. If there is a divine and supernatural soul, our material minds (and bodies) cannot interact with it, and we cannot detect it. Cavendish writes,