The first part of verse 16:90 says:
"Allah enjoins justice, generosity and kind treatment with kindred."
The verse 16:90 is being recited in Jumuah khutbas every Friday in millions of Masajid throughout the world since the time of Umar bin Abdul Aziz (may Allah T'ala be please with him).
The first of these three commandments of Allah T'ala is justice which has two aspects.
To make such arrangements as may enable everyone to get one's due rights without stint. Justice does not, however, mean equal distribution of rights, for that would be absolutely unnatural. In fact, justice means equitable dispensation of rights which in certain cases may mean equality. For example, aII citizens should have equal rights of citizenship but in other cases equality in rights would be injustice. For instance, equality in social status and rights between parents and their children will obviously be wrong. Likewise those who render services of superior and inferior types cannot be equal in regard to wages and salaries. What AIIah enjoins is that the full rights of everyone should be honestly rendered whether those be moral, social, economic legal or political in accordance with what one justly deserves.
"By the grace of Allah, you are gentle towards the people; if you had been stern and ill-tempered, they would have dispersed from round about you" [Qur'an 3:159]
About himself the Prophet (pbuh) said:
"Allah has sent me as an apostle so that I may demonstrate perfection of character, refinement of manners and loftiness of deportment." [Muwatta; Musnad; Mishkat]
Allah T'ala says in the Holy Quran:
وَمَا الْحَيَاةُ الدُّنْيَا إِلاَّ لَعِبٌ وَلَهْوٌ وَلَلدَّارُ الآخِرَةُ خَيْرٌ لِّلَّذِينَ يَتَّقُونَ أَفَلاَ تَعْقِلُونَ