Allah’s forgiveness and mercy is far greater and more vast than the sins of the creation. One must always have trust and hope in Allah in both good times and bad times and especially when seeking His forgiveness.
And the believer who calls out to his Lord for forgiveness demonstrates his true weakness and that he is totally dependent on the Creator. When one confesses his sins to Allah and sincerely repents with hope in His mercy, the heart should come to peace and the soul should feel rest. When a person has hope, he has no reason to despair because it only leads to destruction.
Allah gives hope to all, especially those who despair that there is no reason to despair because Allah is the Most Merciful of all those who show mercy. Allah praises those who repent and turn to Him:
Surat ‘Āli `Imrān (Family of Imran) – سورة آل عمران
وَالَّذِينَ إِذَا فَعَلُوا فَاحِشَةً أَوْ ظَلَمُوا أَنفُسَهُمْ ذَكَرُوا اللَّهَ فَاسْتَغْفَرُوا لِذُنُوبِهِمْ وَمَن يَغْفِرُ الذُّنُوبَ إِلَّا اللَّهُ وَلَمْ يُصِرُّوا عَلَىٰ مَا فَعَلُوا وَهُمْ يَعْلَمُونَ
And those who, when they commit an immorality or wrong themselves [by transgression], remember Allah and seek forgiveness for their sins – and who can forgive sins except Allah ? – and [who] do not persist in what they have done while they know.
أُولَٰئِكَ جَزَاؤُهُم مَّغْفِرَةٌ مِّن رَّبِّهِمْ وَجَنَّاتٌ تَجْرِي مِن تَحْتِهَا الْأَنْهَارُ خَالِدِينَ فِيهَا ۚ وَنِعْمَ أَجْرُ الْعَامِلِينَ
Those – their reward is forgiveness from their Lord and gardens beneath which rivers flow [in Paradise], wherein they will abide eternally; and excellent is the reward of the [righteous] workers. | QS 3:135-136