"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."

“Humanam impotentiam in moderandis et coercendis affectibus servitutem voco; homo enim affectibus obnoxius sui juris non est sed fortunæ in cujus potestate ita est ut sæpe coactus sit quanquam meliora sibi videat, deteriora tamen sequi.”

“Meum institutum non est verborum significationem sed rerum naturam explicare”

“Hic conatus aliquid agendi et etiam omittendi ea sola de causa ut hominibus placeamus, vocatur ambitio præsertim quando adeo impense vulgo placere conamur ut cum nostro aut alterius damno quædam agamus vel omittamus; alias humanitas appellari solet.”

“veritas norma sui et falsi est”

“Ordo et connexio idearum idem est ac ordo et connexio rerum”

“[B]y Natura naturans we must understand what is in itself and is conceived through itself, or such attributes of substance as express an eternal and infinite essence, that is … God, insofar as he is considered as a free cause. But by Natura naturata I understand whatever follows from the necessity of God's nature, or from God's attributes, that is, all the modes of God's attributes insofar as they are considered as things which are in God, and can neither be nor be conceived without God.”