 Avicenna, Mahmud of Ghazni, Abū-Sa'īd Abul-Khayr and Nasir Khusraw traveled to Kharaqan to meet him and expressed their deep admiring feelings and respect for him.Rumi, Attar of Nishapur, Khwaja Abdullah Ansari, Jami and others have narrated many poems about Abu'l-Hasan and have reported his several stories.He was illiterate but had wide inspirational knowledge about the Quran and Hadith; his sayings and speeches are significantly magnificent due to their philosophical views.