We see, from what has been said, that the madman has a true knowledge of what is actually present, and also of certain particulars of the past, but that he mistakes the connection, the relations, and therefore falls into error and talks nonsense. Now this is exactly the point at which he comes into contact with the man of genius; for he also leaves out of sight the knowledge of the connection of things, since he neglects that knowledge of relations which conforms to the principle of sufficient reason, in order to see in things only their Ideas, and to seek to comprehend their true nature, which manifests itself to perception, and in regard to which _one thing_ represents its whole species, in which way, as Goethe says, one case is valid for a thousand. The particular object of his contemplation, or the present which is perceived by him with extraordinary vividness, appear in so strong a light that the other links of the chain to which they belong are at once thrown into the shade, and this gives rise to phenomena which have long been recognised as resembling those of madness. That which in particular given things exists only incompletely and weakened by modifications, is raised by the man of genius, through his way of contemplating it, to the Idea of the thing, to completeness: he therefore sees everywhere extremes, and therefore his own action tends to extremes; he cannot hit the mean, he lacks soberness, and the result is what we have said. He knows the Ideas completely but not the individuals. Therefore it has been said that a poet may know mankind deeply and thoroughly, and may yet have a very imperfect knowledge of men. He is easily deceived, and is a tool in the hands of the crafty.