After the morning prayer, the Prophet would say: أَنَا شَهِيدٌ أَنَّ الْعِبَادَ كُلَّهُمْ إِخْوَة (Musnad Ahmad 19293) O God, I bear witness that all human beings are brothers and sisters. In this world, whether you be at home, in society or a country, you have to live with the feeling that everyone is your brother: every man is your brother and every woman is your sister. This is the best teaching for a good society. 
A society in which people live with the feeling that every man is my brother and every woman is my sister, will only have peace. Such a society will have peace, love, tolerance, adjustment and compassion. Everyone has to pray along these lines and follow this in life. The morning prayer is the first prayer. At that time, doing the above prayer means to pledge for the rest 24 hours to live peacefully. This is indeed a great principle. The image of a believer we get is that he is a peace-loving person. A believer is an asset for his society. A believer is a no-problem person for his society. This is what we learn from the Prophet's life.