1.5.1

The Ontological Argument

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A Priori Arguments

Arguments based on reason are valid a priori, without the need to refer to observations from experience.

*A priori* arguments

A priori arguments

  • A priori arguments are simply logically true in the same way that the following argument is logically true:
    • All men are mortal;
    • Socrates is a man;
    • Therefore, Socrates is mortal.
*A priori* = true by definition

A priori = true by definition

  • A priori arguments are true by definition - in the same way that 2 & plus;2 = 4 is true by definition as another way of defining 2 + 2 is to call it 4.
  • If it can be shown that God exists by definition, then a priori arguments work.

The Ontological Argument

The argument is known in different forms. The generally accepted classical formulation is from Anselm (1033-1109). It is found in chapters 2-4 of his work Proslogion.

Logical deductive argument

Logical deductive argument

  • The logical demonstration in the argument either totally succeeds or totally fails – it is a logical deductive argument.
Anselm’s argument (1st form)

Anselm’s argument (1st form)

  • God is that which nothing greater can be conceived (call this ABC).
  • Even the atheist can have this definition in his understanding.
  • But if he has it in his understanding (ie in the mind) only, then there must be a greater being who exists both in the mind and reality (it is greater to exist both in the mind and reality).
  • So, by the definition ABC, God must exist both in the mind and in reality.
Self-contradiction (1st form)

Self-contradiction (1st form)

  • Another way of saying this is that it is self-contradictory to be capable of conceiving something that nothing greater can be thought, and at the same time to deny that something really exists.
Anselm’s Argument (2nd form)

Anselm’s Argument (2nd form)

  • The second form of the argument is developed to show the impossibility of conceiving of God as not existing.
  • God cannot not be. Any lesser form of existence where it was possible not to be would not fit with the definition of God.
Theory of the 2nd form

Theory of the 2nd form

  • God is ABC (see 1st form).
  • It is greater to be a necessary being than a contingent being.
  • If God exists only contingently, it would be possible to imagine a greater being who exists necessarily.
  • But if God is ABC, then that being has to be God
  • So God must be a necessary being and exist in reality.
    • It is important to note that this is logical necessity and not factual necessity (the kind of necessity arrived at in the cosmological argument).
Jump to other topics
1

Philosophy of Religion

1.1

Ancient Philosophical Influences: Plato

1.1.1Plato's Understanding of Reality1.1.2Plato's Theory of Forms1.1.3Plato's Analogy of the Cave1.1.4The Purpose of Plato's Analogy of the Cave1.1.5Evaluation of Plato's Theories
1.2

Ancient Philosophical Influences: Aristotle

1.2.1Aristotle's Understanding of Reality1.2.2Aristotle's Four Causes1.2.3Aristotle's Prime Mover
1.3

Ancient Philosophical Influences: Soul, Mind, Body

1.3.1Plato & Aristotle's Views of the Soul1.3.2Metaphysics of Consciousness1.3.3Materialism - Ryle’s Philosophical Behaviourism1.3.4Materialism - Identity Theory
1.4

The Existence of God - Arguments from Observation

1.4.1The Teleological Argument - Aquinas' Fifth Way1.4.2The Teleological Argument - Paley & Evolution1.4.3The Cosmological Argument1.4.4Hume's Criticisms: Teleological & Cosmological
1.5

The Existence of God - Arguments from Reason

1.5.1The Ontological Argument1.5.2Criticisms of the Ontological Argument
1.6

Religious Experience

1.6.1Introduction to Religious Experience1.6.2Mystical Experience1.6.3Conversion Experience1.6.4Understanding Religious Experience1.6.5Issues Relating to Religious Experience - Validity1.6.6Issues Relating to Religious Experiences - People
1.7

The Problem of Evil

1.7.1Presentations of the Problems of Evil1.7.2Discussion Points -
1.8

The Nature & Attributes of God

1.8.1Omnipotence1.8.2Omniscience1.8.3Boethius - Divine Knowledge, Free Will & Eternity1.8.4(Omni)benevolence1.8.5Eternity & Free Will
1.9

Religious Language: Negative, Analogical, Symbolic

1.9.1Apophatic & Cataphatic Way1.9.2Symbol1.9.3Discussion Points: Religious Language
1.10

Religious Language: 20th Century Perspective

1.10.1Logical Positivism & Verification Principle1.10.2Wittgenstein1.10.3Falsification Symposium: Flew & Hare1.10.4Falsification Symposium: Mitchell1.10.5Discussion Points: Verification & Falsification1.10.6Discussion Points: Aquinas vs Wittgenstein
2

Religion & Ethics

2.1

Natural Law

2.1.1St Thomas Aquinas - Telos & Four Tiers of Law2.1.2St Thomas Aquinas - Precepts2.1.3St Thomas Aquinas - Real & Apparent Goods2.1.4Discussion Points - Natural Law & Doing Good2.1.5Discussion Points - Telos & Double Effect Doctrine
2.2

Situation Ethics

2.2.1Fletcher's Situation Ethics2.2.2Fletcher's Concept of Conscience2.2.3Discussion Points: Moral Decision-Making2.2.4Discussion Points - Agape
2.3

Kantian Ethics

2.3.1Introduction to Kantian Ethics & Duty2.3.2Hypothetical & Categorical Imperative2.3.3Summum Bonum & Three Postulates2.3.4Discussion Points: Kantian Ethics
2.4

Utilitarianism

2.4.1The Utility Principle2.4.2Act & Rule Utilitarianism2.4.3Discussion Points: Utilitarianism
2.5

Euthanasia

2.5.1Key Concepts for Euthanasia Debates2.5.2Discussion Points: Natural Law & Situation Ethics2.5.3Discussion Points: Sanctity of Life2.5.4Discussion Points: Autonomy & Medical Intervention
2.6

Business Ethics

2.6.1Corporate Social Responsibility & Whistle-Blowing2.6.2Good Ethics & Globalisation2.6.3Discussion Points: Utilitarianism & Kantian Ethics2.6.4Discussion Points: CSR, Globalisation & Capitalism
2.7

Meta-Ethical Theories

2.7.1Naturalism2.7.2Intuitionism2.7.3Emotivism2.7.4Meta-Ethics
2.8

Conscience

2.8.1Aquinas' Theological Approach2.8.2Freud's Psychological Approach2.8.3Comparing Aquinas & Freud
2.9

Sexual Ethics

2.9.1Sexual Ethics2.9.2Development of Religious Beliefs on Sexual Ethics2.9.3Application of Sexual Ethics2.9.4Examining Sexual Ethics
3

Developments in Christian Thought

3.1

Saint Augustine's Teachings

3.1.1Human Nature3.1.2Original Sin & God's Grace
3.2

Death & the Afterlife

3.2.1Heaven, Hell, & Purgatory3.2.2Different Interpretations of the Afterlife3.2.3Election3.2.4The Final Judgement3.2.5Discussion Points: Heaven, Hell & Purgatory
3.3

Knowledge of God's Existence

3.3.1Natural Knowledge3.3.2Revealed Knowledge in Faith, Grace, & Jesus Christ3.3.3Revealed Knowledge in the Bible & Church3.3.4Discussion Points: Reason & Belief in God3.3.5Discussion Points: The Fall & Trust in God
3.4

The Person of Jesus Christ

3.4.1Jesus Christ’s Authority as the Son of God3.4.2Jesus Christ’s Authority as a Teacher of Wisdom3.4.3Jesus Christ’s Authority as a Liberator
3.5

Christian Moral Principles

3.5.1The Bible & Love3.5.2Bible, Church & Reason3.5.3Discussion Points: Christian Ethics3.5.4Discussion Points: Love & the Bible
3.6

Christian Moral Action

3.6.1Dietrich Bonhoeffer & the Confessing Church3.6.2Bonhoeffer & Civil Disobedience3.6.3Bonhoeffer's Teaching on Ethics as Action3.6.4Discussion Points: Civil Disobedience & Bonhoeffer
3.7

Development - Pluralism & Theology

3.7.1Pluralism & Theology: Exclusivism & Inclusivism3.7.2Pluralism & Theology: Pluralism3.7.3Discussion Points: Salvation3.7.4Discussion Points: Pluralism Undermining Beliefs
3.8

Development - Pluralism & Society

3.8.1Development of Multi-Faith Societies3.8.2Responses to Inter-Faith Dialogue3.8.3The Scriptural Reasoning Movement3.8.4Discussion Points: Social Cohesion & Scripture3.8.5Discussion Points: Conversion
3.9

Gender & Society

3.9.1Waves of Feminism3.9.2Traditional Christian Views on Gender Roles3.9.3Christian Views on Gender Roles & Family3.9.4Discussion Points: Secular Views of Gender3.9.5Discussion Points: Motherhood & Family
3.10

Gender & Theology

3.10.1Rosemary Radford Ruether3.10.2Mary Daly3.10.3Discussion Points: Ruether & Daly3.10.4Discussion Points: Male Saviour & Female God
3.11

Challenges

3.11.1Secularism - Sigmund Freud3.11.2Secularism - Richard Dawkins3.11.3Christianity & Public Life3.11.4Discussion Points: Spiritual Values3.11.5Discussion Points: Social Values & Opportunities3.11.6Karl Marx3.11.7Liberation Theology

Practice questions on The Ontological Argument

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  1. 1
    What are *a priori* proved arguments true by?Multiple choice
  2. 2
    In which of Anselm's works are the forms of the ontological argument found? Multiple choice
  3. 3
    What does the second form of Anselm's ontological argument show?Multiple choice
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Hume's Criticisms: Teleological & Cosmological

Criticisms of the Ontological Argument