Therefore, a man may marry the daughter of his brother or sister since he is on a level which is higher in the of the development of the generations. Nevertheless, the younger generation is closer the time of the final redemption and the age of Moshiach, the time of universal peace and wisdom. That gives them a special insight so therefore they have a special insight into the meaning of the historical process from creation until redemption. For this reason, explained the Tzaddik, a man is forbidden to marry his aunt. The Giver would be below the Receiver which is not in accordance with the cosmic structure.
Genuine humility is a sign of greatness.
It could be that the knowledge and understanding of a younger student surpasses that of the teacher. The one who learns from every person. Indeed his children Moshe and Aharon, while being the Torah's greatest sages, were also known to be men of consummate and flawless humility. Therefore in the pursuit of Torah knowledge, one should never embarrassed to learn from someone who knows less than him. Torah truth is valid, regardless from where it comes.