 [W]e make a distinction between direct and reflective thoughts corresponding to the distinction between direct and reflective vision…. I call the first and simple thoughts of infants direct and not reflective…. But when an adult feels [sentio] something, and simultaneously perceives that he has not felt it before [i.e., it involves intellectual memory], I call this second perception reflection, and attribute it to the intellect alone, in spite of its being so linked to sensation that the two occur together and appear to be indistinguishable from each other. (CSM III 357 / AT V 220–221)