Those Who Can’t, Teach? Teaching, Academia, and the True Meaning of Knowledge
This essay begins with a personal experience in Physics education at UFMG to reflect on the meaning of teaching and the persistence of the cliché “those who can’t do, teach.” Drawing from the philosophical tradition of Aristotle—who understood teaching as an expression of true knowledge—and the irony of George Bernard Shaw, the text examines the contemporary tensions within higher education.
It argues that the phrase endures not because it is true, but because it reflects real problems: the devaluation of teaching, the expansion of bureaucracy, the dominance of academic metrics, the loss of social prestige, and the structural constraints of modern universities. At the same time, it explores the growing hyper-specialization and the narrowing of cultural repertoire among both faculty and students, as well as the rise of increasingly superficial forms of knowledge dissemination outside academia.
The essay maintains that teaching is intellectually more demanding than mere execution, as it requires deep understanding and the ability to make ideas intelligible. In a context shaped by artificial intelligence and information abundance, teaching emerges not as a secondary activity, but as a central function in the organization of knowledge. The text concludes that the problem is not teaching itself, but the failure to distinguish between those who merely occupy the role of professor and those who genuinely cultivate thought.

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