Ibn Hanbal (rh) said, “In the time of Ibn al-Mubarak, there was no one who sought after knowledge more than him. He went to Yemen, Egypt, Syria, the Hijaz, Basra and Kufa, and whoever related knowledge and was worthy of it. He wrote from young men and old men. He omitted what was rare. He gave hadiths from books.”
A scholar of the past said, “Ibn al-Mubarak related about 25,000 hadiths. He was asked, ‘Up until when did you study knowledge?’ He said, ‘I hope that you will find me doing that until I die’
This is dedication to seeking knowledge.