No one is ever really taught by another; each of us has to teach himself. The external teacher offers only the suggestion, which arouses the internal teacher, who helps us to understand things.
We have also arranged things so that almost no one understands science and technology. This is a prescription for disaster. We might get away with it for a while, but sooner or later this combustible mixture of ignorance and power is going to blow up in our faces.
I pack my trunk, embrace my friends, embark on the sea and at last wake up in Naples, and there beside me is the stern fact, the sad self, unrelenting, identical, that I fled from.