“He who loves God,” Spinoza says, “cannot strive that God should love him in return.” Goethe, in a passage of characteristic sentimentality, misquote… - Benedictus de Spinoza

When you say that if I deny, that the operations of seeing, hearing, attending, wishing, &c., can be ascribed to God, or that they exist in him in any eminent fashion, you do not know what sort of God mine is ; I suspect that you believe there is no greater perfection than such as can be explained by the aforesaid attributes. I am not astonished ; for I believe that, if a triangle could speak, it would say, in like manner, that God is eminently triangular, while a circle would say that the divine nature is eminently circular. Thus each would ascribe to God its own attributes, would assume itself to be like God, and look on everything else as ill-shaped. The briefness of a letter and want of time do not allow me to enter into my opinion on the divine nature, or the questions you have propounded. Besides, suggesting difficulties is not the same as producing reasons. That we do many things in the world from conjecture is true, but that our redactions are based on conjecture is false. In practical life we are compelled to follow what is most probable ; in speculative thought we are compelled to follow truth. A man would perish of hunger and thirst, if he refused to eat or drink, till he had obtained positive proof that food and drink would be good for him. But in philosophic reflection this is not so. On the contrary, we must take care not to admit as true anything, which is only probable. For when one falsity has been let in, infinite others follow. Again, we cannot infer that because sciences of things divine and human are full of controversies and quarrels, therefore their whole subject-matter is uncertain ; for there have been many persons so enamoured of contradiction, as to turn into ridicule geometrical axioms.

Just as Herder's cosmopolitanism allowed him to become very sympathetic to Judaism as a religion and cultural tradition, so it also allowed him to become a great admirer of the most important Jewish philosopher of the modern period: Spinoza. As is well known, Herder's appropriation (and modification) of the metaphysical monism of Spinoza's Ethics in God: Some Conversations (1787) played a central role in generating the forms of neo-Spinozistic metaphysical monism that later dominated German Idealism and German Romanticism. But Herder's interest in and sympathy with Spinoza in fact reach much further back in time than that work, to the late 1760's, and his intellectual debts to Spinoza extend well beyond the principle of metaphysical monism. Thus, another important debt lies in the anti-dualistic and deterministic philosophy of mind that Herder presented, with explicit mention of Spinoza, in On the Cognition and Sensation of the Human Soul (1778), which is again heavily indebted to the Ethifcs. Moreover, even before Herder was influenced by the Ethics in the ways just mentioned, he was influenced by the Tractatus. Thus, another major area in which he owes debts to Spinoza is the theory of interpretation, especially biblical interpretation, where he borrowed principles from the Tractatus from the late 1760's on. And yet another debt can be seen in Herder's early turn, in about 1770, away from monarchy as a constitutional ideal towards the ideals of democracy and liberalism – for that turn was influenced by Spinoza's championing of the latter ideals in the Tractatus. Putting these cases together, one can indeed see that Herder beginning in the late 1760's engaged in a sort of progressive appropriation of increasingly fundamental levels of Spinoza's thought: first principles of interpretation, then political ideals, then philosophy of mind and metaphysics. All of the principles in question went on to play important roles within German Idealism and German Romanticism. Spinoza's contribution to those movements was thus far greater than has usually been realized.

By that which is self-caused, I mean that of which the essence involves existence, or that of which the nature is only conceivable as existent.