Two other thoughts about love are suggested by this passage. First of all, love is represented here, as in the Symposium, as one of the great powers of nature, which takes many forms and two principal ones, having a predominant influence over the lives of men. And these two, though opposed, are not absolutely separated the one from the other. Plato, with his great knowledge of human nature, was well aware how easily one is transformed into the other, or how soon the noble but fleeting aspiration may return into the nature of the animal, while the lower instinct which is latent always remains. The intermediate sentimentalism, which has exercised so great an influence on the literature of modern Europe, had no place in the classical times of Hellas; the higher love, of which Plato speaks, is the subject, not of poetry or fiction, but of philosophy. Secondly, there seems to be indicated a natural yearning of the human mind that the great ideas of justice, temperance, wisdom, should be expressed in some form of visible beauty, like the absolute purity and goodness which Christian art has sought to realize in the person of the Madonna. But although human nature has often attempted to represent outwardly what can be only 'spiritually discerned,' men feel that in pictures and images, whether painted or carved, or described in words only, we have not the substance but the shadow of the truth which is in heaven. There is no reason to suppose that in the fairest works of Greek art, Plato ever conceived himself to behold an image, however faint, of ideal truths. 'Not in that way was wisdom seen.' We may now pass on to the second part of the Dialogue, which is a criticism on the first. Rhetoric is assailed on various grounds: first, as desiring to persuade, without a knowledge of the truth; and secondly, as ignoring the distinction between certain and probable matter. The three speeches are then passed in review: the first of them has no definition of the nature of love, and no order in the topics (being in these respects far inferior to the second); while the third of them is found (though a fancy of the hour) to be framed upon real dialectical principles. But dialectic is not rhetoric; nothing on that subject is to be found in the endless treatises of rhetoric, however prolific in hard names. When Plato has sufficiently put them to the test of ridicule he touches, as with the point of a needle, the real error, which is the confusion of preliminary knowledge with creative power. No attainments will provide the speaker with genius; and the sort of attainments which can alone be of any value are the higher philosophy and the power of psychological analysis, which is given by dialectic, but not by the rules of the rhetoricians.