directly. In fact, every notion proceeds from the senses, either directly, or in consequence of some analogy, or proportion, or combination. Reasoning having always a share in these last operations. The visions of insanity and of sleep have a real object, for they act upon us; and that which has no reality can produce no action.
XXI. By preconception, the Epicureans mean a sort of comprehension as it were, or right opinion, or notion, or general idea which exists in us; or, in other words, the recollection of an external object often perceived anteriorly. Such for instance, is this idea: “Man is a being of such and such a nature.” At the same moment that we utter the word man, we conceive the figure of a man, in virtue of a preconception which we owe to the preceding operations of the senses. Therefore, the first notion which each word awakens in us is a correct one; in fact, we could not seek for anything if we had not previously some notion