Ibn Al-Mubarak on Knowledge: A man becomes ignorant when he stops seeking knowledge

Nu’aim ibn Hammad reported: Ibn Al-Mubarak, may Allah have mercy on him, said, “A man will continue to have knowledge as long as he is seeking knowledge. If he assumes that he has knowledge, then he has become ignorant.”
Source: al-Mujālasah wa Jawāhir 312
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In another narration, it was said, “For how long will you seek knowledge?” Ibn Al-Mubarak said, “Until death, if Allah wills. Perhaps the words that will benefit me have not yet been written.”
Source: Jāmi’ Bayān al-‘Ilm 428

عن نعيم بن حماد قَالَ ابْنُ الْمُبَارَكِ رحمه الله لَا يَزَالُ الْمَرْءُ عَالِمًا مَا طَلَبَ الْعِلْمَ فَإِذَا ظَنَّ أَنَّهُ قَدْ عَلِمَ فَقَدْ جَهِلَ
312 المجالسة وجواهر العلم للدينوري
وفي رواية أخرى قِيلَ لابْنِ الْمُبَارَكِ إِلَى مَتَى تَطْلُبُ الْعِلْمَ قَالَ حَتَّى الْمَمَاتِ إِنْ شَاءَ اللَّهُ لَعَلَّ الْكَلِمَةَ الَّتِي تَنْفَعُنِي لَمْ أَكْتُبْهَا بَعْدُو
428 جامع بيان العلم وفضله لابن عبد البر