Hasan on Jihad: Best jihad is against your soul, desires

Ibn al-Qayyim reported: It was said to Hasan al-Basri, may Allah have mercy on him, “O Abu Sa’id, which jihad is best?” Hasan said, “Your jihad against your desires.”

Source: Rawḍat al-Muḥibbīn 1/478

عن ابن القيم وَقَدْ قِيلَ لِلْحَسَنِ الْبَصْرِيِّ رَحِمَهُ اللَّهُ يَا أَبَا سَعِيدٍ أَيُّ الْجِهَادِ أَفْضَلُ قَالَ جِهَادُك هَوَاك

1/478 روضة المحبين ونزهة المشتاقين