---
title: Preface
sort: 100
section-id: front-matter
description: Professor Okafor's preface — why philosophy matters, how to use this book, and acknowledgements.
language: en
---

![Library and scholarly atmosphere](assets/images/hero.jpg)

# Preface

Philosophy begins where certainty ends. It is the sustained, rigorous attempt to think carefully about questions that do not yield to experiment, calculation, or common sense alone — questions about the nature of knowledge, the structure of reality, the foundations of morality, and the meaning of a human life. These questions are not trivial or marginal. They are, in many respects, the questions that underlie everything else we do. The scientist who believes her experiments can yield knowledge presupposes an account of knowledge and justification. The judge who sentences a criminal presupposes an account of moral responsibility and desert. The citizen who argues for a just social arrangement presupposes an account of fairness, rights, and legitimate authority.

Philosophy is the discipline that examines these presuppositions — that takes them seriously enough to interrogate them rather than quietly relying on them.

This book is an introduction to three of philosophy's central subdisciplines: epistemology (the theory of knowledge), metaphysics (the study of the fundamental nature of reality), and ethics (the systematic examination of morality). These three areas are not the whole of philosophy — there is also philosophy of language, philosophy of science, political philosophy in its own right, philosophy of mathematics, philosophy of religion, and many others — but they constitute what has traditionally been called the core of the discipline, and they are deeply interconnected. Our account of knowledge bears on our account of what exists. Our account of what exists bears on our account of moral facts. The connections run in every direction.

## On This Book

*Foundations of Modern Philosophy* is written for advanced undergraduates and first-year graduate students who have some acquaintance with philosophical questions but no prior systematic training. It assumes intellectual seriousness but not technical background. The goal is not to survey every debate in every area — that would require a library, not a textbook — but to provide rigorous introductions to the central issues, equip the reader with the conceptual vocabulary needed to engage with primary sources, and convey something of the excitement of philosophy as a living intellectual enterprise.

Each chapter introduces a major area of inquiry, presents the central arguments with the care they deserve, and points toward the ongoing debates that the reader will encounter if they pursue the subject further. The book is designed to be read sequentially, but chapters can also be read independently: those with a specific interest in, say, philosophy of mind or free will can begin there and follow the cross-references.

I have tried to write with clarity without sacrificing rigour, and with genuine intellectual engagement without pretending that the questions have been settled. They have not been settled. Some of them may not be settleable. This is not a reason for despair but for sustained attention.

## Philosophy and Disagreement

One thing that surprises new students of philosophy is how much disagreement persists among careful, intelligent, well-informed people. In mathematics, experts eventually converge. In philosophy, they often do not. This is sometimes taken as evidence that philosophy makes no progress, or that philosophical questions are somehow empty.

I believe this is wrong, for two reasons.

First, philosophical progress is real, even when consensus is absent. We understand the problems more precisely than we did. The conceptual terrain has been mapped. Certain paths have been shown to be dead ends. The space of viable positions has been narrowed, even if it has not collapsed to a single point.

Second, sustained intelligent disagreement is not a failure — it is what happens when the questions are genuinely hard and the standards of evidence genuinely exacting. The fact that Kant, Mill, and Aristotle disagree about the foundations of morality does not mean there are no good arguments in ethics. It means the questions are difficult enough that even great minds approach them from different directions and reach different conclusions.

Students who enter philosophy looking for certainty will be disappointed. Students who enter looking for difficult questions asked well, with intellectual honesty and genuine rigour, will find that and more.

## Acknowledgements

This book has accumulated debts over many years of teaching. Students at the University of Lagos, Cambridge, and Princeton asked the questions that forced me to think more carefully; colleagues in seminars and conference rooms challenged positions I held too comfortably; many generations of undergraduates reminded me, by their confusion and their insight alike, what it is actually like to encounter these ideas for the first time.

I am grateful to my research assistants, Amara Osei-Bonsu and Lars Eriksson, for careful reading of the manuscript. My editor, who has the good philosopher's gift of asking exactly the right question at exactly the wrong moment, improved the book considerably.

My deepest debts are to the philosophers whose work is discussed in these pages. I have tried to present their arguments with fairness. Where I have failed, the failure is mine.

*James Okafor*
*Lagos / Princeton, 2026*
