‘Abdullah ibn al-Mūbārak [d. 181H] said, “Worldly people leave the world before having feasted on the sweetest thing in it.”

They asked him what that was and he answered: “The knowledge of Almighty God.

Isfahani, Hilya, VIII:167.

(Read on pg 136, Ibn Qayyim al-Jawziyya, The Invocation of God. The Islamic Texts Society. UK:2000 .)