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bal badā lahum mā kānū yukhfūna min qablu wa-law ruddū la-ʿādū li-mā nuhū ʿanhu wa-ʾinnahum la-kādhibūna
Indeed, what they used to hide before has now become evident to them. But were they to be sent back they would revert to what they were forbidden, and they are indeed liars.
— Ali Quli Qarai
Surah Al-‘An’am, Verse 28
28. "Rather, what they used to hide before has (now) appeared to them; and even if they were returned, they would revert to what they were prohibited, and most certainly they are liars."
The Resurrection Day is the day of manifestation of people's hidden secrets. The Qur'an has frequently pointed out this fact. A few of these Qur'anic occurrences are as follows:
On the Day of Judgment, all the secrets will be uncovered.
It is impossible for the mortals to return from the coming world back to this world. The verse continues saying:
There are some vicious persons that we cannot expect them to become well again. They will not change even with the respite they will ask for. Sometimes it happens that a person is confronted with difficulties, calamities and bitter circumstances. When such a person is in that condition, the one may make some good decisions, but later, when he reaches to ease and welfare, he forgets all of them.
So, when telling lies becomes a quality in a person, he will tell a lie in the Hereafter, too, and will bring some false claims there.