Hadith Qudsi 16
AIUlh screens the believer in the world as well as in the Hereafter
16) Narrated Safwan bin Muhriz Al-Mazini: While I was on my way along with Ibn 'Umar taking (holding up) his hand in mine. Suddenly a man appeared to him and said: What did you hear Allah's Messenger saying about confidential talk (secret conversation)? He said: I heard Allah's Messenger saying: (On the Day of Resurrection) Allah will draw near to a believer and put His forgiveness over him and screen him (his sins) then Allah will say: Do you know such and such sin? Do you know such and such? He will say: Yes, my Lord! This conversation will continue) until Allah will make him confess his sins, and thinks that he is ruined. Then Allah will say: I concealed them (your sins in the world) and I do forgive you today. Then he will be given the record book containing his good deeds. As regards, the infidels and hypocrites, the witnesses will say: These are the people who have disbelieved their Lord. Behold! Allah's Curse is upon transgressors.
(This Hadith is sound and reported by Bukhari, Muslim and Ibn Majah)
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Allah's mercy can be seen in this world. An evidence of this is that he covers the sinners though He is All-Mighty and AlIKnowing. A further evidence is that he also forgives the same sins in the Hereafter. He may also uncover you as a penaltyin this world. So one should always care that Allah is watching him.