Saeed ibn Jubayr, May Allah shower him with Mercy, said:

A man remains knowledgeable for as long as he continued to learn [and seek knowledge], once he abandons knowledge and believes that he has had enough and is sufficient with what he has, then he is the most ignorant one can be!

Reference:

[1] Al-Faqeeh wa Al-Mutafaqih 3/174; The author of ‘Fuqahaa Munadillun’ p. 83 says that Imam Malik often repeated this statement.

كان سَعِيدَ بْنَ جُبَيْرٍ يَقُولُ : لا يَزَالُ الرَّجُلُ عَالِمًا مَا تَعْلَمُ ، فَإِذَا تَرَكَ الْعِلْمَ وَظَنَّ أَنَّهُ قَدِ اسْتَغْنَى وَاكْتَفَى بِمَا عِنْدَهُ كَانَ أَجْهَلَ مَا يَكُونُ

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