Ibn Manadhir reported: I asked Abu ‘Amr ibn al-Ala’, may Allah have mercy on him, “For how long is it appropriate for a man to learn?” Abu ‘Amr said, “It is appropriate for him to learn his entire life.”
Sufyan ibn ‘Uyaynah, may Allah have mercy on him, was asked, “Which people are most obliged to seek knowledge?” Sufyan said, “Those who have the most knowledge, for their mistakes are the most distasteful.”
Source: Jāmi’ Bayān al-‘Ilm 429
عن ابن مناذر سَأَلْتُ أَبَا عَمْرِو بْنَ الْعَلاءِ رحمه الله حَتَّى مَتَى يَحْسُنُ بِالْمَرْءِ أَنْ يَتَعَلَّمَ فَقَالَ مَا دَامَ تَحْسُنُ بِهِ الْحَيَاةُ
وَسُئِلَ سُفْيَانُ بْنُ عُيَيْنَةَ رحمه الله مَنْ أَحْوَجُ النَّاسِ إِلَى طَلَبِ الْعِلْمِ قَالَ أَعْلَمُهُمْ إِنَّ الْخَطَأَ مِنْهُ أَقْبَحُ
429 جامع بيان العلم وفضله لابن عبد البر