Back 
Surah 21. Al-Anbiya
Ayah 37 - 41
37 خُلِقَ ٱلْإِنسَـٰنُ مِنْ عَجَلٍ ۚ سَأُو۟رِيكُمْ ءَايَـٰتِى فَلَا تَسْتَعْجِلُونِ
38 وَيَقُولُونَ مَتَىٰ هَـٰذَا ٱلْوَعْدُ إِن كُنتُمْ صَـٰدِقِينَ
39 لَوْ يَعْلَمُ ٱلَّذِينَ كَفَرُوا۟ حِينَ لَا يَكُفُّونَ عَن وُجُوهِهِمُ ٱلنَّارَ وَلَا عَن ظُهُورِهِمْ وَلَا هُمْ يُنصَرُونَ
40 بَلْ تَأْتِيهِم بَغْتَةً فَتَبْهَتُهُمْ فَلَا يَسْتَطِيعُونَ رَدَّهَا وَلَا هُمْ يُنظَرُونَ
41 وَلَقَدِ ٱسْتُهْزِئَ بِرُسُلٍ مِّن قَبْلِكَ فَحَاقَ بِٱلَّذِينَ سَخِرُوا۟ مِنْهُم مَّا كَانُوا۟ بِهِۦ يَسْتَهْزِءُونَ
[37-41] Man is a creature of haste (and impatience).41 Well, you need not be impatient: I will show you My signs before long.42 They ask, "Anyhow, when will this threat be made good, if you speak the truth?" Would that the disbelievers knew something about the time, when they shall neither be able to protect their faces from the Fire nor their backs, nor will they get any succor from anywhere! For that catastrophe will occur all of a sudden and will overpower them so abruptly that they shall neither be able to ward it off nor shall they get any respite. As for their scoff, the Messengers before you also have been scoffed at, but the scoffers were encircled by that very doom at which they used to scoff.
41This is not the literal translation of the Text; its purport according to the Arabic usage is: "Man is a hasty and impatient creature by his very nature." The same thing has been stated in XVII:11: "Man is very hasty and impatient."
42From the succeeding sentences it is obvious that "Signs" here stands for the things that have been mentioned therein-the "threat" of the scourge of Allah, Resurrection and Hell. They made fun of these, as if to say: "This man threatens us with the scourge of Allah and the torment of the Day of Resurrection if we deny him and that we shall become fuel of Hell; but nothing of the sort has befallen us. We are as strong as ever and nothing seems to be happening".