"Do not be mistaken about the word “Substance.” Spinoza took it in its purest meaning, and had to take it in that way if he wanted to proceed geometrically and set down a primitive notion as a basis. What is Substance but a thing which is self-dependent, which has the cause of its existence in itself? I wish that this pure meaning of the word could have been introduced into our philosophy. In the strictest sense, nothing in the world is a Substance, because everything depends on everything else, and finally on God, who therefore is the highest and only Substance. This geometrical conception could not have become generally adopted in a philosophy which must preserve its popular character, for we, in all our dependence yet consider ourselves independent, and in a certain sense, as we shall soon see, we may so consider ourselves."

“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.”