Shaykh Muqbil ibn Haadee al-Waadi’ee رحمه الله تعالى :

يا أبنائي لو كان العلم يسقى في كأس لأسقيتموه، و لكن لا يتحصل عليه إلا بكد و حك الركب

“Oh my children, if knowledge could be poured into a glass, I would pour it for you, but it is not obtained except by hard work, exhaustion and scraping of the knees.”

{Nubdhah Mukhtasarah, 44}