Common sense is practical judgment in everyday situations. It’s the ability to make reasonable decisions without needing expert knowledge or deep analysis.
The irony of common sense is that it’s not common at all. If it were, we wouldn’t need the phrase. What we call “common sense” is actually a sophisticated blend of experience, pattern recognition, social awareness, and practical reasoning that varies enormously between people and cultures.
What common sense actually involves:
- Practical reasoning — knowing what to do in everyday situations without overthinking
- Social calibration — reading situations accurately and responding appropriately
- Risk assessment — intuitive understanding of what’s dangerous and what’s safe
- Cause and effect — “if I do X, Y will probably happen”
- Proportionality — matching the response to the situation. Not overreacting, not under-reacting.
Why intelligent people sometimes lack common sense:
- Over-reliance on theory and abstraction
- Optimization for one domain at the expense of general competence
- Overthinking simple problems
- Being so deep in their own head that they miss obvious social cues
Common sense is intelligence applied to the mundane. And the mundane is where most of life happens. You can be brilliant in your field and still make terrible decisions about money, relationships, health, or daily life.
The relationship between common sense and wisdom: common sense is wisdom’s everyday clothes. Wisdom is common sense elevated to life’s bigger questions.
Building common sense: get diverse experience, pay attention to consequences, learn from mistakes (yours and others’), and stay grounded in practical reality.