The man himself!
He's obviously older and without the pacience he used to have. It's like he has no filter anymore. He just says whatever he wants and for that reason he might not sound as nice and pleasant as before but the wisdom and experience is there.
He made his part getting rich and sharing how he did it. It's not a recipe everyone is able to follow but most of the advice is easily understandable and could help many people to avoid common mistakes like accepting the endless rat race.