Humans have a strong tendency to rationalise their beliefs, even when those beliefs are no longer helpful. Cognitive research shows that intelligence does not necessarily protect against this tendency; in some cases, it can enhance a person’s ability to justify existing views rather than challenge them. As a result, blind spots can persist unnoticed. This is where a thinking partner can be valuable. Having someone who can question assumptions, surface patterns, and reflect what may be difficult to see or easy to avoid can support clearer and more objective thinking.