Locke endorses a distinction between passive reflection and voluntary attentive reflection, which he occasionally labels contemplation. Failure to recognize this distinction properly has had an effect on interpretations of Locke’s theory of reflection, and caused puzzlement about the relation between reflection and consciousness. In particular, the function of reflection as a passive internal sense that produces simple ideas of mental operations has been downplayed in favour of the view that reflection in one manner or another involves attention and/or presupposes consciousness of mental operations. This has led a number of scholars to maintain, implicitly or explicitly, that Locke in fact abandons either his doctrine of sensation and refle...