(I think I occasionally suffer from a second-order form of the Dunning-Kruger effect he references: I know I'm not that great... that must mean I'm more enlightened! The awareness of this doesn't help either; I think it's recursively deceiving.)
I went to one of those reputed to be wise... and when I conversed with him... it seemed to me that this man seemed to be wise, both to many other human beings and most of all to himself, but that he was not.
I reasoned with regard to myself: I am wiser than this human being. For probably neither of us knows anything noble and good, but he supposes he knows something when he does not know, while I, just as I do not know, do not even suppose that I do.
Is the summary really just as simple as its important that you hire people that get things done (firstly) but also in a smart way? Is that it?