Hilaal Ibn al-‘Alaa (may Allah have mercy upon him) stated:

Seeking knowledge is difficult. Memorizing it is more difficult than seeking it. And acting in accordance to it is more difficult than memorizing it.

Source: Al-Kabaa-ir of Imaam adh-Dhahabee, pg. 76

Translated by Abu Yusuf Khaleefah
24th of Shawwaal, 1435 – August 20th, 2014
Masjid Nur Allah, Lefrak City, Corona, NYC

Original Arabic

قال هلال بن العلاء – رحمه الله – : طلب العلم شديد، وحفظه أشد من طلبه، والعمل به أشد من حفظه )) الكبائر للذهبي ص. 76 ))