The Ants - 27:40
"And one who had knowledge of the Book said, "I can bring it to you faster than the time it takes you to blink your eye."When he saw him standing beside him, he said, "This is a favor from my Lord. He is testing me whether I will be thankful or ungrateful. And he who is ungrateful, let him know that my Lord is Rich, honored."
The intention is that Allah is rich enough to replace you with a people who will not be ungrateful:
The Cattle/6:89
Those are they to whom We gave the Book and wisdom and prophethood. If that people disbelieve in them, We will replace them with a people who will not disbelieve in them.
Originator/35:15
O mankind, you are dependent on Allah, but Allah is not dependent on anyone, the Praised.
Originator/35:16
If He wills, He will take you away and bring in your place new creatures.
Originator/35:17
This is not difficult for Allah.
Muhammad/47:38
You are called to spend in the Way of Allah, but some of you are stingy. Whoever is stingy is stingy towards himself. Allah is rich and you are poor. If you turn away, He will replace you with another people, but they will not be like you.