Abstract
It would be easy enough to support the claim that the man who introduced post-Kantian idealism into the French universities did so primarily because he found in this system a way to demonstrate the Spiritualist doctrine which came from Biran, the Eclectics, and particularly from Ravaisson. Idealism, in effect, was to Jules Lachelier more of a premise than a conclusion. Now although it might be true that post-Kantianism had been able to provide the right kind of support for the main Spiritualist beliefs, notably the thesis of the reality of Spirit, its presence in nature, and indeed its primacy over nature, the fact remains, and this is what I shall attempt to show, that this idealism is incompatible with a notion that plays a prominent role in the Spiritualist doctrine: that of the existence of a transcendent God. Here, then, is what I should like to claim: that the same principles which were used to prove the Spiritual nature of both thought and matter should render impossible not only the proof of a transcendent God, but also the mere entertaining of the hypothesis of such a being.