Nothing falls outside divine knowledge. However much a person may forget his deeds and the course of his life, God, the All-Knowing, the All-Wise, will make him fully aware of all he has done, from beginning to end!
Sabaʾ: 3 وَ قالَ الَّذينَ كَفَرُوا لا تَأْتينَا السَّاعَةُ قُلْ بَلى وَ رَبِّي لَتَأْتِيَنَّكُمْ عالِمِ الْغَيْبِ لا يَعْزُبُ عَنْهُ مِثْقالُ ذَرَّةٍ فِي السَّماواتِ وَ لا فِي الْأَرْضِ وَ لا أَصْغَرُ مِنْ ذلِكَ وَ لا أَكْبَرُ إِلاَّ في كِتابٍ مُبينٍ
Those who disbelieve say, “The Hour will never come to us.” Say, “Yes indeed, by my Lord, it will surely come to you.” He is the Knower of the unseen. Not even the weight of an atom in the heavens or on earth escapes Him, nor anything smaller or larger, but it is all recorded in a clear Book.
A human being is both the hardware and the software of his own deeds: he dwells within himself, and his deeds are recorded and preserved in his very being!
Al-Isrāʾ: 13 وَ كُلَّ إِنسانٍ أَلْزَمْناهُ طائِرَهُ في عُنُقِهِ وَ نُخْرِجُ لَهُ يَوْمَ الْقِيامَةِ كِتاباً يَلْقاهُ مَنْشُوراً
We have fastened each person’s record around his neck, and on the Day of Resurrection We will bring it forth for him as a book he will find open.
Al-Kahf: 49 وَ وُضِعَ الْكِتابُ فَتَرَى الْمُجْرِمينَ مُشْفِقينَ مِمَّا فيهِ وَ يَقُولُونَ يا وَيْلَتَنا ما لِهذَا الْكِتابِ لا يُغادِرُ صَغيرَةً وَ لا كَبيرَةً إِلاَّ أَحْصاها وَ وَجَدُوا ما عَمِلُوا حاضِراً وَ لا يَظْلِمُ رَبُّكَ أَحَداً
The Book will be set down, and you will see the guilty terrified by what it contains. They will cry, “Woe to us! What is this Book? It leaves nothing, small or great, unrecorded!” They will find all that they did set before them, and your Lord wrongs no one.