Since all ideas originate in sensation, Regius had to acknowledge that we often come to have ideas that originate from imagined realities and that, in the case of veridical and non-veridical perceptions, the subjective experiences are often sufficiently similar that one cannot be certain of a correspondence between ideas and reality. In contrast with the Cartesian rational defence of the reliability of our cognitive faculties, Regius claimed that one must rely on Scripture for this purpose (Regi