According to Norman Vincent Peale, The question Isaac should refer to as he proceeds to make an ethical decision is that "How does the action I am proposing to take make me feel about myself?"
For better understanding, we have to understand why Isaac should ask Himself that question following Norman Vincent Peale suggestions
From the above, we can therefore say that the answer According to Norman Vincent Peale, The question Isaac should refer to as he proceeds to make an ethical decision is that "How does the action I am proposing to take make me feel about myself?" is correct
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