Allah describes the regret of the disbelievers when facing Him, and their disappointment at the commencement, along with theirsorrow for not performing good deeds and for their evil deeds

This is why Allah said,

حَتَّى إِذَا جَآءَتْهُمُ السَّاعَةُ بَغْتَةً قَالُواْ يحَسْرَتَنَا عَلَى مَا فَرَّطْنَا فِيهَا

About the sentence: وَهُمْ يَحْمِلُونَ أَوْزَارَ‌هُمْ (And they shall be carrying their burdens) in verse 31, it appears in Hadith narrations that, on the day of Qiyamah, the deeds of good people will become their ride while the evil deeds of evil people will be placed like a burden on their heads.

Noteworthy here is that disbelievers and sinners will do everything possible to save their skins on the fateful day of Resurrection. They will be nervous and confused. Sometimes they would hide behind false swearing. At others, they would wish to be returned to the world of their earlier experience. But, none of them will say: Now, we have believed and now we shall be doing nothing but what is good - because they would have seen reality and seen it very clearly - that the phase of Akhirah, the Hereafter, is not the Venue of Deeds (Dar al-Amal), and that the soundness of 'Iman (faith) depends on its being ` bil-ghayb,' that is, without having the need to see what is Unseen. Confirming what has been seen is simply acting in line with what has been personally seen. It is not what the attestation to the truth of Allah and His Messenger is. So, let us be very clear that working for the pleasure of Allah Ta` ala, earning its fruits in the form of the promised state of everlasting bliss, hoping to be blessed with Paradise in the Hereafter, and having a good life of peace and tranquility right here are things which can be achieved only (repeat, only) through the life of the present world, neither before, nor after - for it is not possible to achieve these in the universe of spirits (arwah) before it, nor is it possible to achieve it in the domain of the Hereafter, after the world of our experience is no more there.