أَخْبَرَنَا بِشْرُ بْنُ الْحَكَمِ، قَالَ: سَمِعْتُ سُفْيَانَ، يَقُولُ: قَالَ الزُّهْرِيُّ: "كُنْتُ أَحْسَبُ بِأَنِّي أَصَبْتُ مِنْ الْعِلْمِ، فَجَالَسْتُ عُبَيْدَ اللَّهِ، فَكَأَنِّي كُنْتُ فِي شِعْبٍ مِنْ الشِّعَابِ".
It is narrated from Sufyan (may Allah have mercy on him), Imam Zuhri (may Allah have mercy on him) said: I used to think that I had completed knowledge, but when I kept the company of Ubaidullah (bin Abdullah bin Mas'ud), I realized that I was only in one of the many valleys or ravines of knowledge (i.e., compared to him, my knowledge was very little).