“Common sense" is for when people agree with your prejudices “Common sense” isn’t a method — it’s just your personal intuition dressed up as authority. It’s shaped by your upbringing, your culture, your biases, and your blind spots. What feels “obvious” to you often just means “familiar.” Science exists precisely because common sense is unreliable: the Earth feels flat, heavy objects feel like they should fall faster, and the Sun feels like it goes around us. All wrong. Critical thinking tests instinct against evidence; “I believe my own etyes and common sense” just protects whatever you already believe. If your argument depends on common sense alone, you’re not reasoning — you’re rationalising.