Oddly Wired
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ego

You sabotage your own work to protect your ego.

A 1978 study showed that students would rather choose a drug that hinders their performance than risk failing without an excuse.

When people doubt their ability to succeed, they create obstacles to explain away a potential failure. By blaming the handicap, you keep your perceived competence intact in your own mind, regardless of the actual result.

You choose a built-in excuse over the possibility of a hard truth.

Where this comes from

Study
Jones and Berglas, 1978
What the check found
The study exists and is seminal in psychology. Although the provided reference material lacks the quote, this is a well-established scientific finding in psychological literature.
Confidence
Solid, with limits

Related

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