What is the ruling on a student saying, “I succeeded because of my intelligence,” or a merchant saying, “I profited because of my knowledge of trade”?

Question:
A questioner says: If a student says, “I succeeded because of my intelligence,” or a merchant says, “I profited because of my knowledge of trade,” is this disbelief in the blessing? And if it is disbelief, is it minor or major?

Answer:
This is the statement of Qarun: . The student who says, “I succeeded because of my intelligence, because of my memorization,” or the owner of wealth who says, “I obtained this wealth through my skill, my hard work, and my earning,” and does not say, “This is from the favor of Allah and the success of Allah,” this is disbelief in the blessing. It is minor disbelief, but it is very serious.