Is there a link to his actual speech anywhere or are we only able to take the author’s 2nd hand interpretation?

It isn't really surprising if he he’s insecure and bitter. That kind of thing is the pattern of nearly every successful athlete ever born. Its one of the reasons that while there are many professionals in the entertainment industry whose work is admirable, there are almost none worth knowing off the court or in other words, outside of their area of expertise.

Success breeds selfishness. In the end, what other reward is there?