Although this is a somewhat older book (published before 2000) it is still a useful and informative introduction to three of the main ‘rationalist’ philosophers of the seventeenth century.
The introduction provides a good overview of the era, as well as of the difference between rationalists (such as Descartes, Spinoza and Leibniz) and empiricists (such as Locke, Berkeley, and Hume). Ultimately the distinction is not half as clear cut as some neat summaries of philosophy portray it. Yes empiricists focus on observation and what human senses can learn. And Yes rationalists focus on mental and psychological processes and what they contribute to philosophy. But rationalists are not dismissing empiricism. On the contrary, they presuppose its central ideas.
Those issues are explained well in the introduction and so the book opens with an overview which sets the scene with some commendable nuance.
The introductions to the lives of the philosophers is also clear and maintains a good balance between general summary and interesting details. For example, who would have thought that Descartes motto was ‘shun publicity.’
The main part of the book is simply an overview of important aspects of philosophy, with a summary of what each of the three rationalists had to say about those issues. It includes the issues of methodology, substance, causation and free will, with occasional forays further afield.
In places I thought that the summaries could have done with some additional explanation. For example, we hear that all three rationalists held theories of free will (liberty of spontaneity) which had more in common with versions of determinism, than modern ideas about free will. And yet Leibniz wrote a ‘theodicy’ defending free will. He argued in that book that humans have free will because their will is not necessitated towards any particular outcomes. But surely if their actions are dictated by their natures and circumstances, then what does it mean to talk of sin? That issue dangled in the background of several paragraphs in the book but it was never really explained.
I would have also welcomed a little more information about what Descartes, Spinoza and Leibniz were reacting against in the scholastic theology of the day. There was an occasional reference to Suarez, as one of the principle sources of what they were reacting against, but a little more information about what his views were would have helped to clarify matters.
Textually the book was clearly laid out with material broken down into short sections within each chapter. There was the occasional misprint (such as ‘univenrse’ for universe, in the Introduction).
Overall, this is a scholarly book with around 20% of the text devoted to footnotes. It is pitched to be readable to students without prior expertise in the subject area or era, rather than to just established academics.
These comments are based on a reading of the 1988 OUP edition.