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An open mind, in questions that are not ultimate, is useful. But an open mind about the ultimate foundations either of Theoretical or of Practical Reason is idiocy. If a man's mind is open on these things, let his mouth at least be shut. He can say nothing to the purpose. Outside the Tao there is no ground for criticizing either the Tao or anything else.
C. S. Lewis
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Interpretation

What this quote means

An open mind is valuable for mundane questions, but should be closed when it comes to fundamental truths.

C. S. Lewis emphasizes the importance of having a discerning mind that can engage with everyday questions while also recognizing when to hold firm on fundamental beliefs. He suggests that an open mind towards ultimate truths or principles leads to confusion rather than clarity. The quote encourages critical thinking and the recognition that certain foundational concepts, like the Tao, should not be subjected to skepticism, as they serve as necessary frameworks for understanding.

Themes

Open MindTruthPhilosophyReasonUltimate Foundations

In practice

Example use cases

During a philosophical debate, one might quote Lewis to emphasize the importance of understanding one's core beliefs.

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A dogmatic belief in objective value is necessary to the very idea of a rule which is not tyranny or an obedience which is not slavery.
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Aim at heaven and you will get earth thrown in. Aim at earth and you get neither.
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Forgiving and being forgiven are two names for the same thing. The important thing is that a discord has been resolved.
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I pray because I can't help myself. I pray because I'm helpless. It doesn't change God - it changes me.
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The instrument through which you see God is your whole self. And if a man's self is not kept clean and bright, his glimpse of God will be blurred
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