What is meant by likening the narrowness of the disbelievers' chests to ascending into the sky?

Question:
May Allah reward you, Your Eminence, father. The questioner says: In describing Allah the Exalted, the chests of the disbelievers are described as narrow, as if they were ascending into the sky. What is the meaning of ascending into the sky?

Answer:
It means it is impossible for them to believe, just as it is impossible for them to ascend to the sky. For Allah has punished them and prevented them from believing. Just as they cannot ascend to the sky, they will not be able to, or will not accept, faith; they hate it, may Allah protect us from that. It was also said that the meaning, according to the moderns now, is that the one who flies in the air, the air rushes toward him and the two lungs narrow. His self becomes constricted. This is part of the inimitability of the Qur'an. Allah knows best. Yes.