Spinoza did not envision secular Judaism. To be a secular or assimilated Jew is, in his view, nonsense. It is to be a nonsectarian sectarian. For him… - Benedictus de Spinoza

Spinoza would not tolerate restrictions, imposed by any political or religious system or by any moral attitude. He struggled for the ideal of free thought. Hardly any other philosopher made so many enemies. He was labelled ‘a troublemaking Jew’, banned from the synagogue and from the academic establishment. Even his pupils would acknowledge him in private. And when Karl Ludwig asked the impoverished lonely philosopher to lecture at the University of Heidelberg, he turned him down. Spinoza could not guarantee that his thinking would not threaten ‘widely accepted religious concepts’. The philosopher in him preferred the quiet retiring life to a bourgeois career.

Spinoza was a republican democrat and a supporter of the politician Johan De Witt (1625–72), an opponent of the House of Orange. After De Witt's death, the aristocratic Orange faction took power and restored a more conventional social order (which was subsequently imposed on Britain when one of them acquired the English throne in 1689). By that time ‘Spinozism’ was already a thriving underground cult with ardent supporters in many countries: ‘The battle was on to fix the image of the dying Spinoza in the perceptions and imagination of posterity,’ Israel writes, since ‘the final hours of a thinker who seeks to transform the spiritual foundations of the society around him become heavily charged with symbolic significance in the eyes of both disciples and adversaries.’ Plainly, this battle still continues. It is not to disregard or minimise such a striking lineage to observe that Spinozism had limitations associated with the society it came from, in which countries were struggling to emerge from absolutism and theocratic tyranny. Today, Spinoza's greatness has to be defended against the delusions of a belated progeny, rather as Marx had to be in the later 19th and 20th centuries.

...Humiliated beyond sufferance, Uriel went home, wrote a fierce denunciation of his persecutors, and shot himself. This was 1640. At that time Baruch Spinoza, "the greatest Jew of modern times," and the greatest of modern philosophers, was a child of eight, the favorite student of the synagogue. It was this Odyssey of the Jews that filled the background of Spinoza's mind, and made him irrevocably, however excommunicate, a Jew. Though his father was a successful merchant, the youth had no leaning to such a career, and preferred to spend his time in and around the synagogue, absorbing the religion and the history of his people. He was a brilliant scholar, and the elders looked upon him as a future light of their community and their faith.