What is your answer?

What premise is missing from Ima Intuitionist's argument for moral first principles?

    Some moral truths are known.
    [... missing premise ...]
    Our proofs can't continue forever.
    So the basic moral truths are known but not provable.
    { 1 } - "Good" is indefinable.
    { 2 } - God's will creates the moral order.
    { 3 } - We can only prove an moral truth by appealing to a more basic moral truth.
    { 4 } - There's no reason to trust our minds in math but not morality.

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1 is wrong. Please try again.

What premise is missing from Ima Intuitionist's argument for moral first principles?

    Some moral truths are known.
    [... missing premise ...]
    Our proofs can't continue forever.
    So the basic moral truths are known but not provable.

This is close -- but that only counts in horseshoes.

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2 is wrong. Please try again.

What premise is missing from Ima Intuitionist's argument for moral first principles?

    Some moral truths are known.
    [... missing premise ...]
    Our proofs can't continue forever.
    So the basic moral truths are known but not provable.
    { 1 } - "Good" is indefinable.
    { 2 } - God's will creates the moral order.
    { 3 } - We can only prove an moral truth by appealing to a more basic moral truth.
    { 4 } - There's no reason to trust our minds in math but not morality.

This wouldn't make the argument valid.

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3 is correct!

What premise is missing from Ima Intuitionist's argument for moral first principles?

    Some moral truths are known.
    [... missing premise ...]
    Our proofs can't continue forever.
    So the basic moral truths are known but not provable.
    { 1 } - "Good" is indefinable.
    { 2 } - God's will creates the moral order.
    { 3 } - We can only prove an moral truth by appealing to a more basic moral truth.
    { 4 } - There's no reason to trust our minds in math but not morality.

This premise is based on Hume's law, which says that we need a moral premise to deduce a moral conclusion.

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4 is wrong. Please try again.

What premise is missing from Ima Intuitionist's argument for moral first principles?

    Some moral truths are known.
    [... missing premise ...]
    Our proofs can't continue forever.
    So the basic moral truths are known but not provable.
    { 1 } - "Good" is indefinable.
    { 2 } - God's will creates the moral order.
    { 3 } - We can only prove an moral truth by appealing to a more basic moral truth.
    { 4 } - There's no reason to trust our minds in math but not morality.

This wouldn't make the argument valid.

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the end