Happy Accidents
The Mishnah tells us that Rebbe Nechunya ben Hakanah used to utter a short prayer upon entering the beis midrash. Those who witnessed his custom asked about the nature of this prayer.
Humility
The danger of feeling pleased when a colleague errs in Torah learning, and why sages prayed to avoid causing or feeling such joy.
The Mishnah tells us that Rebbe Nechunya ben Hakanah used to utter a short prayer upon entering the beis midrash. Those who witnessed his custom asked about the nature of this prayer.