"Immigrants to the realm of thought"

From the acknowledgements of Nozick's Philosophical Explanations:

"Isn't it ludicrous for someone just one generation from the shtetl, a pisher from Brownsville and East Flatbush in Brooklyn, even to touch on the topics of the monumental thinkers? Of course it is. Yet is was ludicrous for them too. We are all just a few years past something or other, if only childhood. Even the monuments themselves, so serenely in command of culture and intellect, must have been children once and adolescents—so they too are immigrants to the realm of thought. It wouldn't hurt for an acknowledgment of this occasionally through their magisterial prose to peep."