Albert Einstein is famously associated with the observation that “common sense is the collection of prejudices acquired by age eighteen.”
The statement challenges the assumption that commonly held beliefs are necessarily rational, objective or correct. Rather, it suggests that many of our perceptions and judgements are shaped by childhood experiences, family influences, cultural expectations, social conditioning and the environments in which we develop.
In this context, prejudice refers not exclusively to discriminatory attitudes, but also to preconceived ideas and assumptions that we accept without sufficient examination.
From a psychological perspective, this reflects the development of cognitive schemas: mental frameworks through which we interpret experiences and make sense of the world. While these frameworks can be adaptive, they can also reinforce cognitive biases, limit perspective-taking and perpetuate unexamined beliefs.
The broader implication is that familiarity should not be confused with truth, tradition with wisdom, or social consensus with objective reality. Critical thinking requires us to examine the origins of our beliefs, consider alternative perspectives and remain willing to revise our understanding when presented with new evidence.
Intellectual maturity involves recognising that not everything we regard as common sense is necessarily sensible. Personal growth and psychological flexibility require an ongoing willingness to question what we believe, why we believe it and whether those beliefs remain valid.