Imam al-Ḥasan al-Baṣri once saw the famous ascetic Farqad al-Sabakhi.

Al-Ḥasan: “Someone told me that you don’t eat Falu-dhaj (an expensive delicacy)?”
Farqad: “I’m scared that I won’t be able to show enough gratitude to Allah for it!”
Al-Ḥasan: “You silly man! And you think you can offer enough gratitude for just the cold water you drink?!”