Fudayl ibn ‘Iyad (rahimahullah) said:
“Humility is subjecting to what is right [the haqq] and submitting to/following it. If you hear it [haqq] from a child, you accept it, or even if you hear it from the most ignorant of people, you still accept it.”
(Ibn Abid Dunya, At Tawadu’ Wal Khumul: 88, Hilyatul Awliya, vol. 8 pg. 91)
