"Jacobi's book On Divine Things does me no good. How could I welcome the book of a dearly beloved friend in which I found the proposition that 'nature conceals God'. Is it not natural that according to my pure, and deep, and inborn, and expert conception which has taught me unfalteringly to see God in nature and nature in God, so that this conception constitutes the foundation of my entire existence, is it not natural that such a strange and onesided and limited exposition must alienate me from the noble man whose heart I dearly love? However, I did not indulge my painful disappointment, but sought refuge in my old asylum, making Spinoza's Ethics for several weeks my daily entertainment."

“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.”