>>11594096What he means is that the stuff you know from 'education' is the stuff that you've practised to the point that the knowledge is automatic and totally internalised.
So once you've left school and forgotten what year the Magna Carta was signed and how an Oxbow lake forms, you're left with the bits you paid attention to and worked at yourself, like the quadratic formula and how to be a sad loser.
>at least he was humble enough to say that he stood on the shoulders of giantsHe literally said that to insult the shorter Robert Hooke after the controversy over the inverse square law.