For example, courage is the mean between cowardice (deficiency of confidence) and recklessness (excess of confidence). Generosity lies between stinginess and wastefulness. Proper pride (megalopsychia) falls between vanity and excessive humility.
Importantly, the mean is not a mathematical average but relative to the individual and situation. What constitutes appropriate action varies with context. The virtuous person possesses practical wisdom (phronesis) to discern the right measure in each circumstance.
Aristotle emphasizes that finding the mean requires training and habituation. We become courageous by performing courageous acts, generous by practicing generosity. Virtue is not innate knowledge but developed character—a stable disposition to choose the mean.
This framework influenced Western ethics profoundly, offering a nuanced alternative to rigid rules. It recognizes moral life's complexity and the role of judgment in ethical action.
Source
Nicomachean Ethics - Aristotle