The Vatican, and the Calvinist authorities in Holland, heartily approved of this hysterical Jewish condemnation and joined in the Europe-wide suppression of all Spinoza’s work. Had the man not questioned the immortality of the soul, and called for the separation of church and state? Away with him! This derided heretic is now credited with the most original philosophical work ever done on the mind/body distinction, and his meditations on the human condition have provided more real consolation to thoughtful people than has any religion. Argument continues about whether Spinoza was an atheist: it now seems odd that we should have to argue as to whether pantheism is atheism or not. In its own expressed terms it is actually theistic, but Spinoza’s definition of a god made manifest throughout the natural world comes very close to defining a religious god out of existence. And if there is a pervasive, preexisting cosmic deity, who is part of what he creates, then there is no space left for a god who intervenes in human affairs, let alone for a god who takes sides in vicious hamlet-wars between different tribes of Jews and Arabs. No text can have been written or inspired by him, for one thing, or can be the special property of one sect or tribe. (One recalls the question that was asked by the Chinese when the first Christian missionaries made their appearance. If god has revealed himself, how is it that he has allowed so many centuries to elapse before informing the Chinese? «Seek knowledge even if it is in China», said the Prophet Muhammad, unconsciously revealing that the greatest civilization in the world at that time was on the very outer rim of his awareness.) As with Newton and Galileo building on Democritus and Epicurus, we find Spinoza projected forward into the mind of Einstein, who answered a question from a rabbi by stating firmly that he believed only in «Spinoza’s god,» and not at all in a god «who concerns himself with the fates and actions of human beings».

Spinoza de-Judaized his name by changing it to Benedict, outlasted the Amsterdam anathema by twenty years, and died with extreme stoicism, always persisting in calm and rational conversation, as a consequence of the powdered glass that entered his lungs. His was a career devoted to the grinding and polishing of lenses for telescopes and medicine: an appropriate scientific activity for one who taught humans to see with greater acuity. «All our modern philosophers,» wrote Heinrich Heine, «though often perhaps unconsciously, see through the glasses which Baruch Spinoza ground». Heine’s poems were later to be thrown on a pyre by gibbering Nazi bully-boys who did not believe that even an assimilated Jew could have been a true German. The frightened, backward Jews who ostracized Spinoza had thrown away a pearl richer than all their tribe: the body of their bravest son was stolen after his death and no doubt subjected to other rituals of desecration.

Spinoza had seen some of this coming. In his correspondence he would write the word Caute! (Latin for «take care») and place a little rose underneath. This was not the only aspect of his work that was sub rosa: he gave a false name for the printer of his celebrated Tractatus and left the author’s page blank. His prohibited work (much of which might not have survived his death if not for the bravery and initiative of a friend) continued to have a subterranean existence in the writing of others. In Pierre Bayle’s 1697 critical Dictionnaire he earned the longest entry. Montesquieu’s 1748 Spirit of the Laws was considered so dependent on Spinoza’s writing that its author was compelled by the church authorities in France to repudiate this Jewish monster and to make a public statement announcing his belief in a (Christian) creator. The great French Encyclopédie that came to define the Enlightenment, edited by Denis Diderot and d’Alembert, contains an immense entry on Spinoza.

I do not wish to repeat the gross mistake that Christian apologists have made. They expended huge and needless effort to show that wise men who wrote before Christ were in effect prophets and prefigurations of his coming. (As late as the nineteenth century, William Ewart Gladstone covered reams of wasted paper trying to prove this about the ancient Greeks.) I have no right to claim past philosophers as putative ancestors of atheism. I do, however, have the right to point out that because of religious intolerance we cannot know what they really thought privately, and were very nearly prevented from learning what they wrote publicly. Even the relatively conformist Descartes, who found it advisable to live in the freer atmosphere of the Netherlands, proposed a few lapidary words for his own headstone: «He who hid well, lived well».

In the cases of Pierre Bayle and Voltaire, for example, it is not easy to determine whether they were seriously irreligious or not. Their method certainly tended to be irreverent and satirical, and no reader clinging to uncritical faith could come away from their works without having that faith severely shaken. These same works were the best-sellers of their time, and made it impossible for the newly literate classes to go on believing in things like the literal truth of the biblical stories. Bayle in particular caused a huge but wholesome uproar when he examined the deeds of David the supposed «psalmist» and showed them to be the career of an unscrupulous bandit. He also pointed out that it was absurd to believe that religious faith caused people to conduct themselves better, or that unbelief made them behave worse. A vast accumulation of observable experience testified to this common sense, and Bayle’s delineation of it is the reason why he has been praised or blamed for oblique, surreptitious atheism. Yet he accompanied or bodyguarded this with many more orthodox affirmations, which probably allowed his successful work to enjoy a second edition. Voltaire balanced his own savage ridicule of religion with some devotional gestures, and smilingly proposed that his own tomb (how these men did rattle on about the view of their own funerals) be built so as to be half inside and half outside the church. But in one of his most celebrated defenses of civil liberty and the rights of conscience, Voltaire had also seen his client Jean Calas broken on the wheel with hammers, and then hanged, for the «offense» of trying to convert someone in his household to Protestantism. Not even an aristocrat like himself could be counted safe, as he knew from seeing the inside of the Bastille. Let us at least not fail to keep this in mind.

Immanuel Kant believed for a time that all the planets were populated and that these populations improved in character the farther away they were. But even while beginning from this rather charmingly limited cosmic base, he was able to make convincing arguments against any theistic presentation that depended upon reason. He showed that the old argument from design, then as now a perennial favorite, might possibly be stretched to imply an architect but not a creator. He overthrew the cosmological proof of god — which suggested that one’s own existence must posit another necessary existence — by saying that it only restated the ontological argument. And he undid the ontological argument by challenging the simpleminded notion that if god can be conceived as an idea, or stated as a predicate, he must therefore possess the quality of existence. This traditional tripe is accidentally overthrown by Penelope Lively in her much-garlanded novel Moon Tiger. Describing her daughter Lisa as a «dull child», she nonetheless delights in the infant’s dim but imaginative questions: