Ibn ‘Abd al-Hakam reported: Al-Shafi’i, may Allah have mercy on him, said, “Among the degradation of knowledge is that you debate everyone who debates you, or you argue with everyone who argues with you.”
And he said, “Knowledge is ignorance to the people of ignorance, just as ignorance is ignorance to the people of knowledge.”
Source: Manāqib al-Shāfi’ī lil-Bayhaqī 2/151
عَنْ ابن عبد الحكم قال قال الشافعي رحمه الله من إِذَالَةِ العلم أن تناظر كلَّ من ناظرك وتُقاوِلَ كلَّ من قَاوَلَك
وقال العلم جهل عند أهل الجهل كما أن الجهل جهل عند أهل العلم
2/151 مناقب الشافعي للبيهقي