Sufyan ibn Uyaynah رحمه الله said , on the authority of Imam Ibn Shihab al -Zuhri رحمه الله : I used to sit with Ali ibn al - Husayn ( Zain ul Abideen ) a lot and I did not see anyone who was more knowledgeable than him , but he spoke little . Tehzeeb ul Kamal volume 20 page 386
The Revival of Knowledge
It is reported that Imām Al-Zuhrī – Allāh have mercy on him – said:
Those of our scholars who went before us used to say,”Adherence to the Sunnah is salvation, but knowledge is taken away quickly, so the revival of knowledge means the stability of religion and worldly affairs, and the loss of knowledge means the loss of all that.”
Al-Lālakā`ī, Sharh Usūl I’tiqād Ahl Al-Sunnah article 136
Also read
Related sayings.
Knowledge cannot be taken all at once.
Sometimes the manners you learn from a scholar surpass the piece of knowledge you get from him.