Bishr al-Hārith [may Allāh have mercy on him] said:

“The servant [of Allāh] will not attain the sweetness of worship until he places between himself and his lusts and desires a barrier made of iron.”

Hilyat ul-Awliyā’a, 8/345 | Abi Nu’aym al-Asfahāni [may Allāh have mercy on him]

Translation: Authentic Quotes