Psychologia Empirica

in acquiring certain knowledge of things. Wherefore, if anyone should wish to perceive more deeply those things which are handed down in Logic, the doctrine concerning the faculty of knowing—especially its higher part—will hold a torch before him. Therefore, he who, when he has rightly known and perceived those things which we teach in the first part of empirical psychology concerning both the lower and higher parts of the faculty of knowing, subjects the entire theory of Logic to an accurate discussion, will not expend his labor in vain: for he will notice an unexpected light, by which its precepts are suffused, are understood more fully and deeply, and are recognized as being of much greater use than they seemed before, when the mind was still intuiting itself as if through a certain mist. The Art of Invention also considers the use of the faculty of knowing, and indeed considers it to be the principal one. Wherefore, it is not permitted to proceed upon a certain path in this art, unless the theory of psychology concerning the faculty of knowing serves as Ariadne’s thread. For in that art, a method is taught for investigating truth hitherto unknown to us, whether by the right use of the lower faculty, or the higher faculty, or by the duly celebrated union of both. Therefore, one must have a thorough perception of both parts of the faculty of knowing,