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Doubt Quote by Baruch Spinoza

“He who has a true idea, knows at that same time that he has a true idea, nor can he doubt concerning the truth of the thing.” quote by Baruch Spinoza
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“He who has a true idea, knows at that same time that he has a true idea, nor can he doubt concerning the truth of the thing.”

Baruch Spinoza

About This Quote

Source Philosophy: Ethics, 1677

A true idea guarantees its own truth, leaving no room for doubt about its reality.

In simple terms: Knowing something true removes doubt.

Key Takeaway

Trust your insight.

Themes

philosophy epistemology confidence

Mood

thoughtful analytical

Type

philosophical reflective

When to use this quote

  • academic study
  • personal decision‑making
  • ethical reasoning

Key Concepts

rationalism self‑knowledge

Questions to Reflect On

  • How do you verify the truth of an idea?
  • Can certainty ever be harmful?
A Different Perspective

Even true ideas can be misapplied or misunderstood.

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