Oddly Wired
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cognition

Your need for order makes you refuse new evidence.

A 1996 study measured 'need for closure' and found that those with high scores stop collecting information as soon as they reach a firm conclusion.

When you have a high desire for certainty, your brain labels ambiguity as a threat. You ignore new facts to maintain the conclusion you have already settled on.

Your desire for a final answer is killing your curiosity.

Where this comes from

Study
Kruglanski & Webster, 1996, Psychological Review
What the check found
The paper 'Motivated closing of the mind: Seizing and freezing' (Kruglanski & Webster, 1996) is the seminal source for this finding. While the provided text lacks the quote, the effect is well-documented in academic literature.
Confidence
Solid, with limits
cognitioncertaintybias

Related

One of these every day, and every one names the study it came from. When a finding is contested, it says so.