It is reported that Imām Al-Zuhrī – Allāh have mercy on him – said:
We used to sometimes come to a scholar and what we learned of his manners was more beloved to us than the knowledge we took from him.
Abū Nuʿaym, Ḥilyatu Al-ʾAwliyāʾ #4575
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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
Imām Al-Zuhrī said: Verily, knowledge has calamities [that afflict it]. One of its calamities is when the scholar is left, until he goes away with his knowledge. Another calamity is forgetting [knowledge]. Yet another calamity is lying about [knowledge], and this is the worst type. Ibn ‘Abd Al-Barr, Jāmi’ Bayān Al-‘Ilm article 684.
Knowledge cannot be taken all at once.