01
The idea
Impressions about the external world get examined occasionally. Impressions about yourself almost never do. "I am not the kind of person who finishes things." "I always panic in these." "I am behind." These arrive with the same false authority as any other impression and are treated as self-knowledge.
They are not self-knowledge. They are claims, usually assembled from a small number of memorable instances, heavily weighted towards the failures, and stated in a permanent grammar that no evidence could ever satisfy.
The same test applies. What did a camera record? Usually: on four occasions out of eleven, this thing happened. That is a very different claim from "I always", and it is one you can actually work with.
02
Why this matters
Self-descriptions are unusually consequential because they are not merely descriptions — they are instructions. A person who believes they always panic prepares differently, and worse.
They are also stable in a way external impressions are not. A bad impression about a colleague gets corrected by the next meeting. A bad impression about yourself gets confirmed by the mechanism that produced it.
And they are the main route by which this philosophy turns harmful. Combine "everything is up to me" with an unexamined self-verdict and you have a machine for self-contempt.