They tell a story of a worshipper who would eat ten *man* of food in one night and perform a complete recitation of the Quran in prayer until dawn.

A man of wisdom heard this and said: If he had eaten half a loaf of bread and slept, it would have been much more virtuous than this.

Keep your inside empty of food,

So that you may see the light of knowledge within it.

You are empty of wisdom because of this

That you are full of food, as you can see.