I would guess Piaget, because it reminds of this quote from Papert (who drew heavily on Piaget): > Slowly I began to formulate what I still consider the fundam

I would guess Piaget, because it reminds of this quote from Papert (who drew heavily on Piaget): > Slowly I began to formulate what I still consider the fundamental fact about learning: Anything is easy if you can assimilate it to your collection of models. If you can't, anything can be painfully difficult.