These are the prejudices which I undertook to notice here. If any others of a similar character remain, they can easily be rectified with a little th… - Benedictus de Spinoza

It is not possible, I think, to rise from the perusal of the arguments of Clark and Spinoza without a deep conviction of the futility of all endeavors to establish, entirely à priori, the existence of an Infinite Being, His attributes, and His relation to the universe. The fundamental principle of all such speculations, viz. that whatever we can clearly conceive, must exist, fails to accomplish its end, even when its truth is admitted. For how shall the finite comprehend the infinite? Yet must the possibility of such conception be granted, and in something more than the sense of a mere withdrawal of the limits of phænomal existence, before any solid ground can be established for the knowledge, à priori, of things infinite and eternal.

My intellect has been shaped under the sign of Spinoza's words, and it has tried not to be astounded, not to laugh, not to cry, but to understand.

So I resolved to write a novel about his inner life. That was where my personal expertise might help in telling Spinoza's story. After all, he was a human being and therefore must have struggled with the same basic human conflicts that troubled me and the many patients I've worked with over the decades. He must have had a strong emotional response to being excommunicated, at the age of twenty-four, by the Jewish community in Amsterdam—an irreversible edict that ordered every Jew, including his own family, to shun him forever. No Jew would ever again speak to him, have commerce with him, read his words, or come within fifteen feet of his physical presence. And of course no one lives without an inner life of fantasies, dreams, passions, and a yearning for love. About a fourth of Spinoza's major work, Ethics, is devoted to “overcoming the bondage of the passions.” As a psychiatrist, I felt convinced that he could not have written this section unless he had experienced a conscious struggle with his own passions.