The general attitude to knowledge adopted by Vacherot recalls in some respects the metaphysical doctrines of Spinoza, and he endeavours to combine the purely naturalistic view of the world with a metaphysical conception. The result is a profound and, for Vacherot, irreconcilable dualism, in which the real and the ideal are set against one another in rigorous contrast, and the gap between them is not bridged or even attempted to be filled up, as, at a later date, was the task assumed by Fouillee in his philosophy of _idées-forces_. For Vacherot the world is a unity, eternal and infinite, but lacking perfection. Perfection, the ideal, is incompatible with reality. The real is not at all ideal, and the ideal has no reality.[4] In this unsatisfactory dualism Vacherot leaves us. His doctrine, although making a superficial appeal by its seeming positivism on the one hand, and its maintenance of the notion of the ideal or perfection on the other, is actually far more paradoxical than that which asserts that ultimately it is the ideal only which is real. While St. Anselm had endeavoured to establish by his proof of the existence of God the reality of perfection, Vacherot, by a reversal of this proof, arrives at the opposite conclusion, and at a point where it seems that it would be for the ideal an imperfection to exist. The absolute existence of all things is thus separated from the ideal, and no attempt is made to relate the two, as Spinoza had so rigorously done, by maintaining that reality _is_ perfection.[5] [4] It is interesting to contrast this with the attitude of the new spiritualists, especially Fouillée’s conception of idees-forces, of ideas and ideals realising themselves. See also Guyau’s attitude. “_L’idéal n’est-il pas, sur la terre où nous sommes Plus fécond et plus beau que la réalité?” —Illusion féconde_. [5] Vacherot contributed further to the thought of his time, notably by a book on religion, 1869, and later in life seems to have become sympathetic to the New Spiritualism, on which he also wrote a book in 1884. The influence of Vacherot was in some measure continued in that of his pupil, Hippolyte Taine (1828-1893), a thinker who had considerable influence upon the development of thought in our period. His ability as a critic of art and literature was perhaps more marked than his purely philosophical influence, but this is, nevertheless, important, and cannot be overlooked.