Sufyan on Zuhd: He gains wisdom once he forsakes worldly life

Abu Nu’aym reported: Sufyan al-Thawri, may Allah have mercy on him, said, “When a servant renounces the world, Allah will cause wisdom to grow in his heart and to come forth from his tongue. He will grant him insight into the faults of the world, its diseases, and its cures.”

Source: Ḥilyat al-Awliyā’ 6/389

عن أبي نعيم عَنْ سُفْيَانَ الثَّوْرِيِّ رحمه الله قَالَ إِذَا زَهِدَ الْعَبْدُ فِي الدُّنْيَا أَنْبَتَ اللَّهُ الْحِكْمَةَ فِي قَلْبِهِ وَأَطْلَقَ بِهَا لِسَانَهُ وَبَصَّرَهُ عُيُوبَ الدُّنْيَا وَدَاءَهَا وَدَوَاءَهَا

6/389 حلية الأولياء وطبقات الأصفياء