One of the important secrets God reveals to believers is not to quarrel. Or else their strength will depart and they will be weak in heart. The relevant verse is as follows:
Obey God and His Messenger and do not quarrel amongst yourselves lest you lose heart and your momentum disappear. And be steadfast. God is with the steadfast. (Surat al-Anfal: 46)
Qur'anic morality is marked by humility. Those adhering to the moral values of the Qur'an settle quarrels, find solutions to problems, make things easy for people and do not display greed. In the absence of Qur'anic morality, disputes and conflicts are unavoidable. It is perfectly natural that everybody holds different opinions. For instance, 20 people can propose 20 different solutions to a problem. Each solution may be right or consistent within itself. If each one insists on being right, it is obvious that there will be disorder and conflict. In such a case, rather than unity by consensus of 20 people, there will be quarrels and personal ambitions that will impede good deeds engaged in for the cause of God. Consequently, the whole strength of these 20 people will dissipate, the union and brotherhood among them will be dissolved.
Believers should feel a profound love for one another, make sacrifices and establish a strong solidarity and co-operation among themselves. Especially at times of hardship, they should keep themselves occupied with the remembrance of God, and be much more patient and supportive towards one another. Quarrelling reduces strength, whereas co-operation increases the strength among the believers. In another verse, God has revealed the secret that if believers are not friends and protectors of one another, there will be confusion and great corruption in the land:
Those who disbelieve are the friends and protectors of one another. If you do not act in this way (protect each other) there will be turmoil in the land and great corruption. (Surat al-Anfal: 73)
Each one of these is a secret God has revealed and charged Muslims with responsibilities. No Muslim should consider a quarrel with another Muslim trivial, by saying, "So what if we quarrelled?" Because, as God informs us, every dispute among Muslims, means the diminishing of the strength of believers for which Muslims will give an account to God. That is why our beloved Prophet, peace be upon him, said, "Fear God. Make peace among you. Certainly, God makes peace among the Muslims."(Ramuz Al-Ahadith, vol 1, p. 13)
Muslims should not look for one another's mistakes or failings, but rather cover faults of other Muslims with compassion. The strength believers derive from this unity, means devoting all energy to spread God's religion and the morals of the Qur'an. With unity they can concentrate on communicating the signs of the existence of God through scientific works and render praiseworthy services to humanity. One must remember, however, that everyone renders his services essentially to earn an eternal life in the hereafter and to be safeguarded from God's punishment.