"When you say Spinoza, however, besides being too flattering, the comparison is not biographically so true. My Spinozism is in the Life of Reason, less obviously, perhaps, yet more dominantly, than in Realms of Being. These, as you know, are not at all like Spinoza's attributes. They are not aspects or forms of the same reality, absolutely parallel and coextensive. My realms are layers: more as in Plotinus; and my moral or “spiritual” philosophy is again less Spinozistic than in the humanistic period. Spinoza's moral sentiments were plebeian, Dutch, and Jewish: perfectly happy in his corner, polishing his lenses, and saying, Great is Allah. No art, no high politics, no sympathy with greatness, no understanding of courage or of despair."

“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.”