It is He alone who is free from all sin and error and who...
It is He alone who is free from all sin and error and who derives no benefit from the society. Therefore, everyone must have true faith in such an Entity and the Islamic disciplines that He sends down. They must not consider their own interests or wishes above that of what has been decided by Allah (Glorified and Exalted is He) and they must take inspiration from Him alone.
If we give up such Islamic disciplines and solely rely on our wishes and desires to formulate laws and regulations, then the sphere of our lives would resemble an army with multiple leaders. Even if such an army was fully equipped and ready to fight a battle, they would definitely fall into confusion and disorder since they are being led by various leaders and commanders, and after a short period of time, they would fall to the prowess of the enemy thus being destroyed.
The stage that we live our life upon is just like the battle-front and the wishes and desires of each person, each stratum of people or each group are similar to having multiple commanders for an army. If there was to be any difference of opinion within the commanders, then this would lead the people into great conflicts and would drag them into confusion and disorder which would ultimately result in the disregard of justice amongst one another.