Philosophy of Religion

Core Philosophical Problems

Course 3 · Chapter 8 · Philosophy of Religion

Course 1's own capstone closed with Aquinas's Five Ways, real arguments drawing directly on Aristotle's physics. This chapter widens the lens — a different kind of argument for God's existence, two real objections to it, and philosophy's own oldest, sharpest challenge to belief in a good and all-powerful God at all.

Aquinas's Five Ways, Revisited

Course 1, Chapter 10 already covered Aquinas's Five Ways in depth — the Unmoved Mover, the First Cause, contingency, degree, and final cause, each built directly on Aristotle's own real arguments from Course 1, Chapter 4. All five are cosmological or teleological arguments — they reason from some observed feature of the world (motion, causation, purpose) toward God as the necessary explanation.

Anselm's Ontological Argument

A genuinely different kind of argument needs no observation of the world at all. Anselm of Canterbury's real 1078 Proslogion — the same Anselm credited, in Course 1, Chapter 10, with actually coining "faith seeking understanding" — defines God as "a being than which no greater can be conceived." His argument: if such a being existed only in the mind, a still-greater being — one existing in reality too — could be conceived. That would contradict the original definition of God as the greatest conceivable being. Therefore God must exist in reality, not just as an idea.

A Direct Echo of Course 1 This isn't a loose thematic link — it's the exact same historical figure making two of medieval philosophy's own most influential real contributions, roughly two decades apart: the phrase this course already corrected back to him in Course 1, and this chapter's own centerpiece argument.

Two Real Objections

Gaunilo's Lost Island

Anselm's real contemporary, Gaunilo of Marmoutiers, offered a real, pointed parody: imagine "the most excellent island conceivable." By Anselm's own logic, if this island existed only in the mind, a still-more-excellent island — one existing in reality — could be conceived, so the perfect island must exist. Since that's absurd, Gaunilo argued the argument's own form must be flawed — it proves too much, working for anything at all, not just God.

Kant's "Existence Is Not a Predicate"

Kant's real objection, from the same Critique of Pure Reason covered in Course 2, Chapter 4, goes deeper: "being" isn't a real property that adds anything to a concept's own description at all — it simply indicates that the concept is actually instantiated in reality. A perfectly described, supremely great being that doesn't exist is still fully conceivable and coherent; adding "and it exists" doesn't make the concept any greater or more complete, it just asserts something additional and separate. Anselm's whole argument, on Kant's account, rests on treating existence as though it were a quality like "wise" or "powerful," which it isn't.

The Problem of Evil

If God is genuinely all-powerful, all-knowing, and perfectly good, why does evil and suffering exist at all? A classic formulation runs: if God is willing to prevent evil but unable, God isn't all-powerful; if able but unwilling, God isn't good; if both willing and able, why does evil exist? If neither, why call it God at all?

A Genuine Correction — this formulation is almost universally attributed to Epicurus. The real record doesn't support that attribution with confidence: no surviving text by Epicurus himself contains it. Its earliest documented source is Lactantius, a 4th-century Christian writer, who offers no citation for attributing it to Epicurus at all. Some real scholarship (Reinhold F. Glei) argues the argument is actually anti-Epicurean or non-Epicurean in origin, with the philosopher and skeptic Carneades a real, plausible alternative source. The attribution to Epicurus, real and widespread as it is, rests almost entirely on one later, potentially biased source.

A Direct Echo of Course 1 Course 1, Chapter 7 already covered a real, related correction about Epicurus — his own actual ascetic teaching being inverted into the "hedonist" reputation popular culture now attaches to his name. This chapter's own correction is a second, genuinely separate case of the same real figure's legacy being distorted by later hands — first his own teaching, now an argument he may never have actually made.

Pascal's Wager

Blaise Pascal's real argument, from his posthumously published Pensées (1670), is genuinely different in kind from everything else in this chapter — not an argument that God exists, but an argument that believing is the rational choice regardless. Since reason alone can't settle the question, Pascal frames it as a wager: believing costs little if God doesn't exist, but gains infinite reward if God does; disbelieving risks infinite loss for a small finite gain. A real, standard objection — the "many gods" problem — asks which god you're supposed to wager on, given competing religions each claiming exclusive truth; Pascal's own real, brief response dismisses casual doubt as insincere, though later defenders have refined the reply further.

Argument	Type	Real objection
Aquinas's Five Ways	Cosmological / teleological — from observed features of the world	Depends on Aristotelian physics later chapters of Course 2 complicated
Anselm's ontological argument	A priori — from the concept of God alone	Gaunilo's Lost Island; Kant's "existence is not a predicate"
The problem of evil	An argument against God's existence (or nature)	Its own popular attribution to Epicurus is itself genuinely disputed
Pascal's Wager	Pragmatic / decision-theoretic, not evidential	The "many gods" problem

Where This Goes Next — Chapter 9 turns to aesthetics, the one core branch this course hasn't yet drawn on any earlier chapter's material for — genuinely new territory.

Questions to Sit With

Reflection 1

Kant argues existence isn't a real property that can make a concept "greater." Does that objection feel decisive to you, or does Anselm's own argument survive it in some form?

Reflection 2

The problem of evil's attribution to Epicurus rests on one later, possibly biased Christian source. Does the argument's own force depend at all on who first made it, or does that question matter only for the history, not the philosophy?

Reflection 3

Pascal's Wager doesn't try to prove God exists — only that believing is the rational bet. Is that a legitimate kind of argument for religious belief, or does genuine belief need to rest on something more than a calculated wager?

Quick Reference — Chapter 8

Aquinas's Five Ways (Course 1) — cosmological/teleological arguments built on Aristotle
Anselm's ontological argument (1078) — God as "a being than which no greater can be conceived"; the same Anselm behind "faith seeking understanding" (Course 1)
Gaunilo's Lost Island and Kant's "existence is not a predicate" — two real objections
The problem of evil — its popular attribution to Epicurus is genuinely disputed, resting on one uncited 4th-century Christian source
Pascal's Wager (1670) — a pragmatic, not evidential, argument for belief; the "many gods" objection