When someone deeply associates their self-identity with an idea they weaken their rationality filter in regards to that idea. Examples include politics and religion. Overcome via Outcome Dissociation.
Humans cannot resist the temptation to string facts together with stories. We can connect anything together, regardless of real causal linkages. This results in a false sense of understanding.
Almost nothing is black or white. Always consider how something fits on a spectrum, as all of reality is grey.
Self-worth is not coupled with outcomes or results of your work. [Article]