According to a saying of the Prophet, related in the Sahih of Imam Muslim: “God has a hundred mercies, and one of them He has sent down amongst jinn and men and cattle and beasts of prey. Thereby they are kind and merciful unto one another, and thereby the wild creature inclines to tenderness unto her offspring. And ninety-nine mercies has God reserved unto Himself, that there with He may show mercy unto His servants on the Day of Resurrection.”
The mercy of a mother manifests itself in multiple ways. Should her infant baby strike her on the face, the mother will not take offence. She will not react by striking her child back. She will hold her child close to her, turning his apparent act of aggression into an act of love, rewarding him for what was a punishable deed. Incidents of this nature occur in every home.
Human beings do not have knowledge of the unseen, so they have to suffer all sorts of setbacks in life. They lack willpower, so they tend to give way to base impulses and commit grave mistakes.