Oddly Wired
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psychology

You cannot un-know what you have already learned.

Once you acquire knowledge, you systematically overestimate how easily others can grasp the same concept.

This bias prevents experts from effectively teaching beginners. You struggle to imagine the mental state of someone who lacks your background information. Even when you consciously try to simplify, your brain defaults to your current level of understanding.

Your clarity is often the barrier to another person's learning.

Where this comes from

Study
Camerer, Loewenstein, and Weber, 1989
What the check found
The claim accurately describes the 'curse of knowledge' as established in the 1989 study by Camerer, Loewenstein, and Weber. The provided reference material did not contain the quote, but the cited study is authoritative.
Confidence
Well replicated

Related

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