Argument from free will
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The argument from free will (also called the paradox of free will, or theological fatalism) contends that omniscience and free will are incompatible, and that any conception of God that incorporates both properties is therefore inherently contradictory. The argument may focus on the incoherence of people having free will, or else God himself having free will. These arguments are deeply concerned with the implications of predestination, and often seem to echo the dilemma of determinism.
Omniscience and free will
… "Does God know or does He not know that a certain individual will be good or bad? If thou sayest 'He knows', then it necessarily follows that [that] man is compelled to act as God knew beforehand he would act, otherwise God's knowledge would be imperfect.…"
Various means of reconciling God's omniscience (possession of all possible knowledge) with human free will have been proposed:
Counters reconceptualizing free will
- God can know in advance what I will do, because free will is to be understood only as freedom from coercion, and anything further is an illusion. This is the move made by compatibilistic philosophies.
- The sovereignty (autonomy) of God, existing within a free agent, provides strong inner compulsions toward a course of action (calling), and the power of choice (election). The actions of a human are thus determined by a human acting on relatively strong or weak urges (both from God and the environment around them) and their own relative power to choose.
- Bhaktivedanta Swami Prabhupada has stated that man does have limited free will; he can decide whether or not to surrender to the will of Krishna. All other material happenings and their implications are inconceivably predestined.
Counters reconceptualizing omniscience
- Molinism argues that God not only knows the singular outcomes of all our future free choices, but also knows what singular free choices would have eventuated in any possible circumstance. Truths of the latter sort are called "counterfactuals of freedom," and God's knowledge thereof is referred to as his "middle knowledge." This view holds an Ockhamist conception of foreknowlege, in which there are singular truths about what inevitably happens in the future despite the plurality of future contingents which may and may not come to pass. Molinsts say that such foreknowlege can't determine such outcomes, because that's not the kind of thing foreknowledge can do.
- Compatablistic Calvinism re-defines a free act as one that is done in accordance with one's desires. While this view avoids incoherence, it is arguable that this is the kind of freedom Theists are concerned to reconcile with divine foreknowledge.
- Open Theism holds that future free decisions are known under the category of possibility, which is their true nature. The problem of freedom and foreknowledge therefore, is due to the traditional theologies of libertarian freedom positing gratuitous knowledge on God's part, which overextends God's settled knowledge to the realm of unsettled possibilities.
"God is outside of time"
A proposition first offered by Boethius and later by Thomas Aquinas and C. S. Lewis, suggests that God's perception of time is different, and that this is relevant to our understanding of our own free will. In his book Mere Christianity, Lewis argues that God is actually outside of time and therefore does not "foresee" events, but rather simply observes them all at once. He explains:
But suppose God is outside and above the Time-line. In that case, what we call "tomorrow" is visible to Him in just the same way as what we call today." All the days are "Now" for Him. He does not remember you doing things yesterday, He simply sees you doing them: because, though you have lost yesterday, He has not. He does not "foresee" you doing things tomorrow, He simply sees you doing them: because, though tomorrow is not yet there for you, it is for Him. You never supposed that your actions at this moment were any less free because God knows what you are doing. Well, He knows your tomorrow's actions in just the same way—because He is already in tomorrow and can simply watch you. In a sense, He does not know your action till you have done it: but then the moment at which you have done it is already "Now" for Him.
An obvious criticism of God being outside of time is that this does not seem to grant free will. Predestination, regardless of how God perceives time, still seems to mean a person's actions will be determined. A logical formulation of this criticism might go as follows:
- God timelessly knows choice "C" that a human would claim to "make freely".
- If C is in the timeless realm, then it is now-necessary that C.
- If it is now-necessary that C, then C cannot be otherwise (this is the definition of “necessary”). That is, there are no actual "possibilities" due to predestination.
- If you cannot do otherwise when you act, you do not act freely (Principle of Alternate Possibilities)
- Therefore, when you do an act, you will not do it freely.
God's free will
Dan Barker suggests that this can lead to a "Freewill Argument for the Nonexistence of God"  on the grounds that God's omniscience is incompatible with God having freewill and that if God does not have freewill God is not a personal being.
- "knows everything that God chooses to know and that is logically possible to know"; Or instead the slightly stronger:
- "knows everything that is logically possible to know"
If omniscient is used in the first sense then the argument's applicability depends on what God chooses to know, and therefore it is not a complete argument against the existence of God. In both cases the argument depends on the assumption that it is logically possible for God to know every choice that he will make in advance of making that choice.
- See the various controversies on God's Omniscience, and in particular on the critical notion of Foreknowledge
- Stanford Encyclopedia of Philosophy, Foreknowledge and Free Will
- Internet Encyclopedia of Philosophy, Foreknowledge and Free Will
- Though Moses Maimonides was not arguing against the existence of God, but rather for the incompatibility between the full exercise by God of his omniscience and genuine human free will, his argument is considered by some as affected by Modal Fallacy. See, in particular, the article by Prof. Norman Swartz for Internet Encyclopedia of Philosophy, Foreknowledge and Free Will and specifically Section 6: The Modal Fallacy
- The Eight Chapters of Maimonides on Ethics (Semonah Perakhim), edited, annotated, and translated with an Introduction by Joseph I. Gorfinkle, pp. 99–100. (New York: AMS Press), 1966.
- Gospel of Thomas 3
- Holy Bible, 2 Peter 1:10, Webster's Encyclopedic Dictionary
- The Philosopher's Handbook, Stanley Rosen, ed., Random House Reference, New York, 2000.
- Consolatio Philosophiae, Boethius, book 5:4
- See also Divine Providence versus the concept of Fate
- C. S. Lewis Mere Christianity Touchstone:New York, 1980 p.149
- The Freewill Argument for the Nonexistence of God by Dan Barker Freethought Today, August 1997 
- see e.g. Richard Swinburne Does God Exist? of The Catechism of the Catholic Church
- see e.g. John Polkinghorne
- Thomas Aquinas. Summa Contra Gentiles
- Thomas Aquinas. Summa Theologica I, Q. XIV, esp. Art. 13: "Whether the Knowledge of God is of Future Contingent Things?".
- Boethius. The Consolation of Philosophy. Many editions.
- Hasker, William. God, Time, and Foreknowledge". Ithaca: Cornell University Press, 1998.
- Molina, Luis de. On Divine Foreknowledge, trans. Alfred J. Freddoso. Ithaca: Cornell University Press, 1988.
- Plantinga, Alvin. "On Ockham's Way Out". Faith and Philosophy 3 (3): 235–269.
- Ockham, William. Predestination, God's Foreknowledge, and Future Contingents, trans. M.M. Adams and N. Kretzmann. Indianapolis: Hackett Publishing Company, 1983.
- Zagzebski, Linda. "The Dilemma of Freedom an Foreknowledge". New York: Oxford University Press, 1991.
- Luther, Martin: De servo arbitrio, in English: On the Bondage of the Will. In Latin and German 1525, in modern English: J.I. Packer and O. R. Johnston, trans. Old Tappan, New Jersey: Fleming H. Revell Co., 1957.
- Free Will – Freethoughtpedia.com original article on the nature of Free Will and how it applies to religion
- Foreknowledge and Free Will article in the Internet Encyclopedia of Philosophy
- Omniscience and Divine Foreknowledge article in the Internet Encyclopedia of Philosophy
- The Paradox of Free will – An online discussion
- Thomas Aquinas. Summa Theologica I, Q. XIV, Art. 13.