"It is unquestionably the peacefulness and calm of the Spinozist system which particularly produces the idea of its depth, and which, with hidden but irresistible charm, has attracted so many minds. The Spinozist system will also always remain in a certain sense a model. A system of freedom — but with just as great contours, with the same simplicity, as a perfect counter-image of the Spinozist system — this would really be the highest system. This is why Spinozism, despite the many attacks on it, and the many supposed refutations, has never really become something truly past, never been really overcome up to now, and no one can hope to progress to the true and the complete in philosophy who has not at least once in his life lost himself in the abyss of Spinozism. Nobody who wishes to arrive at his own firm conviction should leave unread the main work of Spinoza, his Ethics , and I should like to urge everyone who is seriously concerned with his education not only to study assiduously on his own, which no teacher can replace, but to be most conscientious and careful in the choice of what he reads."

“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.”