I call him free who is led solely by reason. - Benedictus de Spinoza

Without a doubt, the Theologico-Politicus Theological-Political Treatise is one of the most important and influential books in the history of philosophy, in religious and political thought, and even in Bible studies. More than any other work, it laid the foundation for modern critical and historical approaches to the Bible. And while often overlooked in books on the history of political thought, the Treatise also has a proud and well-deserved place in the rise of democratic theory, civil liberties, and politcal liberalism.

How many philosophers and historians of philosophy have gone along with the academies, burning with the desire to be able to sit there! The Dutch thought and art of the siècle d'or reside not only outside of the academies but also, to a large extent, outside of the universities. Spinoza's example serves for all the others. When declining the proposal of the excellent and honorable Sir J. L. Fabritius, who in the name of the Palatine Elector offers him a chair at Heidelberg, Spinoza reminds him that the freedom to philosophize cannot be limited in any way.

[We] will discuss Soul and Body, the doctrine of God, and Ethics. ...We shall find that Leibniz no longer shows great originality, but tends, with slight alterations of phraseology, to adopt (without acknowledgment) the views of the decried Spinoza. We shall find also many more minor inconsistencies than in the earlier part of [Leibniz's] system, these being due chiefly to the desire to avoid the impieties of the Jewish Atheist, and the still greater impieties to which Leibniz's own logic should have led him.