"Not only Goethe's poetry but his science is Spinozistically motivated. Convinced of the oneness of nature, he approached it with a certainty to discover in it oneness, and his discovery of the os intermaxtllare in man, which influenced the development of comparative anatomy, is one of the by-products of his Spinozistic sentiments. In his theory of the metamorphosis of the plants, which he expounded scientifically and poetically, he also expressed a good deal of Spinozism. Spinoza enabled him to read the various pages of nature as one book. Goethe respected Kant and may be described as a Kant scholar, but he was a Spinoza adherent. His world-picture is Spinozistic and not Kantian."

“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.”