"Careful the spell you cast, not just on children. Sometimes the spell may last Past what you can see And turn against you... Careful the tale you tell. That is the spell."

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We are all shaped by the tools we use, in particular: the formalisms we use shape our thinking habits, for better or for worse, and that means that we have to be very careful in the choice of what we learn and teach, for unlearning is not really possible.

— Edsger Dijkstra