Musar do Psalmów 119:99

And there is another excellent modesty — to study in the presence of the very young and ask them to explain something that he, the teacher, does not understand. And he should not say, "How can I study in the presence of youngsters and how can I seek and expect to find an answer from him when he is younger than I?" And on this subject it is said: "From all my mentors I have learned" (Ps. 119:99). And further did our Sages say: "Be exceedingly humble" (Aboth 4:4), in the presence of all men. Not before the great alone must one be humble in spirit, but also before the small.

One occupied with the Torah must also learn from every person, as it is written (Psalms 119:99), "From all of my teachers have I been enlightened." As the Torah is not completed with one teacher; but since he becomes a student to all, he merits to become a chariot for Victory and Majesty, 'Those taught of God'; and the one who bestows Torah upon him is on the level of Splendor. And behold, in his sitting and studying Torah, he merits that Splendor flows on Victory and Majesty and [that] he actually be on Their level.

The twenty-fourth thing one should remember is that a man whose eyes are weak cannot see the fine engraving on gold and silver dishes. Even though he sees all these things, he cannot perceive them as clearly as one whose eyes are strong. Thus, if a man has studied Torah and wisdom in his youth and it appears to him that he understands them properly, let him not rely upon that childhood understanding, for wisdom strengthens itself as one advances in years, and he now understands more clearly than he did in his youth. Therefore, when your wisdom becomes stronger, you should begin to consider well all the matters around you, and then you will understand and increase your ability to distinguish, and you will know the matter more clearly than you did previously. And you must continue always to search out from every man what you do not know, as it is said, "From all my mentors I have learned" (Ps. 119:99). And you should not think that no one can tell you anything new that you did not know when you were young. Concerning this it is said, "Seest thou a man wise in his own eyes? There is more hope of a fool than of him" (Prov. 26:12).