I say expressly, that the mind has not an adequate but only a confused knowledge of itself, its own body, and of external bodies, whenever it perceiv… - Benedictus de Spinoza

One of Spinoza's most important conclusions is that of the human being's necessity to overcome the contradiction between the finite and the infinite. Spinoza was able to express the very nature of the Judaeo-Christian way of thought and, at the same time, to remain outside it and even negate it. Both in the Jewish and the Christian traditions, God creates the world but is outside it. Spinoza, on the other hand, would not say that God creates the world, but that He produces it – in philosophical terms, He causes it. God, for Spinoza, is not outside the world and this view was the object of very harsh criticism by his contemporaries. The Jewish community in Holland even saw fit to excommunicate him. The God of Judeao-Christian thought, according to Spinoza, is an invention of man, who imagines that God thinks and acts as human beings do.

[Spinoza, the Romantic] The paradox marking Spinoza's reappearance in modernity is well known. If Mendelssohn wished to “give him new credence by bringing him closer to the philosophical orthodoxy of Leibniz and Wolff,” and Jacobi, “by presenting him as a heterodox figure in the literal sense of the term, wanted to do away with him definitively for modern Christianity”—well, “both failed in their goal, and it was the heterodox Spinoza who was rehabilitated.” The Mendelssohn-Jacobi debate can be grafted onto the crisis of a specific philosophical model. It generates a figure of Spinoza capable of assuaging the exacerbated spiritual ten­sion of that epoch, and of constituting the systematic preamble of the relation between power and substance—between subject and nature. Spinoza, the damned Spinoza, had a resurgence in modernity as a Romantic philosopher. Lessing won out by recognizing in Spinoza an idea of nature which was capable of balancing the relation between feeling and intellect, freedom and necessity, and history and reason. Herder and Goethe, against the subjective and revolutionary impa­tience of the Sturm und Drang, based themselves on this powerful image of synthesis and recomposed objectivity: Spinoza is not only the figure of Romanticism; he constitutes its grounding and its fulfillment.

According to the seventeenth-century way of thinking, an atheist was by definition a decadent. If there was no God (or, at least, no providential, rewarding-and-punishing God of the sort worshipped in all the traditional religions), the reasoning went, then everything is permitted. So a non-beliver would be expected to indulge in all manner of sensual stimulation... to lie, cheat, and steal...
Spinoza, according to all seventeenth-century interpreters, rejected all the traditional ideas about God; he was indesputably a heretic. Yet his manner of living was humble and apparently free of vice. Then, as now, the philosopher seemed a living oxymoron: he was an ascetic sensualist, a spiritual materialist, a sociable hermit, a secular saint. How could his life have been so good, the critics asked, when his philosophy was so bad?