  The simplicity of moral properties, such as rightness and goodness, and our ideas of them, was important for early intuitionists such as Price, as he accepted the empiricist doctrine that simple ideas cannot be invented but must be acquired by immediate intuition, as all simple ideas must “be ascribed to some power of immediate perception in the human mind” 1758/1969, 141), i.e., either sensibility or the  understanding.[11]  Consequently, the ideas of right and wrong must be immediate perceptions of either sensibility or the  understanding.[12] 