pood
Veteran Member
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- Oct 25, 2021
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- Basic Beliefs
- agnostic
I just signed up and have mostly skimmed this thread, apologies, but I was attracted here by the posts of Marvin Edwards. His thinking seems to comport with mine, a line of thought I find rather underrepresented in the debate on causal determinism and free will.
As he has pointed out, there is a difference between will and must. It is a distinction so important that there is even a fallacy, from modal logic, attached to this confusion, called the modal scope or just modal fallacy.
Suppose today it is true that tomorrow there will be a sea battle. The worry, going back to the ancient Greeks, is that if this is right, tomorrow there must be a sea battle; fatalism obtains, and no one has free will.
The modal fallacy lies in confusing necessity (could not have been otherwise) with contingency (could have been otherwise).
In the case of the sea battle, if today it is true that tomorrow there will be a sea battle, sure enough, tomorrow there will be a sea battle. But it does not follow that there must be a sea battle.
All that follows is that true propositions, and the events that they describe or predict, must match — otherwise the propositions would be false.
If, then, tomorrow there is not a sea battle, then a different prior proposition would have been true — today it is true that tomorrow there will not be a sea battle.
Suppose God exists and knows in advance everything that I will do. If he knows today that tomorrow I will eat eggs for breakfast, then, intuition inclines us to think, tomorrow I must eat eggs for breakfast. But, as with the sea battle example, this is a modal fallacy. It’s true if God knows in advance I will eat eggs for breakfast, then sure enough I will do so. But it doesn’t follow that I must do so. If I have pancakes instead, then God would have had a different propositional foreknowledge, viz., that I will eat pancakes for breakfast tomorrow.
So it is with causal determinism. Given a vast ensemble of antecedent events — stretching all the way to the Big Bang? — tomorrow there will be a sea battle, or tomorrow I will eat eggs. But neither has to be the case. Rather, if there is no sea battle, or I eat pancakes instead of eggs, then a different ensemble of antecedent events would have preceded these choices or events.
As Marvin notes, determinism does not hold sway over us or cause us to do anything. The laws of nature are descriptive and not prescriptive. In fact, the idea that the so-called laws of nature govern the universe seems to be a hangover from theism, in which we have a lawgiver laying down the laws. But with no lawgiver there are no laws, only descriptions of what happens in the world, including our own freely willed acts.
As he has pointed out, there is a difference between will and must. It is a distinction so important that there is even a fallacy, from modal logic, attached to this confusion, called the modal scope or just modal fallacy.
Suppose today it is true that tomorrow there will be a sea battle. The worry, going back to the ancient Greeks, is that if this is right, tomorrow there must be a sea battle; fatalism obtains, and no one has free will.
The modal fallacy lies in confusing necessity (could not have been otherwise) with contingency (could have been otherwise).
In the case of the sea battle, if today it is true that tomorrow there will be a sea battle, sure enough, tomorrow there will be a sea battle. But it does not follow that there must be a sea battle.
All that follows is that true propositions, and the events that they describe or predict, must match — otherwise the propositions would be false.
If, then, tomorrow there is not a sea battle, then a different prior proposition would have been true — today it is true that tomorrow there will not be a sea battle.
Suppose God exists and knows in advance everything that I will do. If he knows today that tomorrow I will eat eggs for breakfast, then, intuition inclines us to think, tomorrow I must eat eggs for breakfast. But, as with the sea battle example, this is a modal fallacy. It’s true if God knows in advance I will eat eggs for breakfast, then sure enough I will do so. But it doesn’t follow that I must do so. If I have pancakes instead, then God would have had a different propositional foreknowledge, viz., that I will eat pancakes for breakfast tomorrow.
So it is with causal determinism. Given a vast ensemble of antecedent events — stretching all the way to the Big Bang? — tomorrow there will be a sea battle, or tomorrow I will eat eggs. But neither has to be the case. Rather, if there is no sea battle, or I eat pancakes instead of eggs, then a different ensemble of antecedent events would have preceded these choices or events.
As Marvin notes, determinism does not hold sway over us or cause us to do anything. The laws of nature are descriptive and not prescriptive. In fact, the idea that the so-called laws of nature govern the universe seems to be a hangover from theism, in which we have a lawgiver laying down the laws. But with no lawgiver there are no laws, only descriptions of what happens in the world, including our own freely willed acts.