This was also how princes were trained but they were only admitted "by merit". The philosophy of these "Seven Wise Men" directed the affairs of the Persian Empire  until their overthrow by Muhammad in 638 AD.
The training of princes followed a similar approach, where only those who demonstrated exceptional abilities were admitted. The wisdom and knowledge imparted by the "Seven Wise Men" shaped the governance of the Persian Empire until it was overthrown by Muhammad in 638 AD.