Full knowledge can only be attained by knowing

1- Knowing Allaah, the Creator and Provider Who created man from nothing and bestowed blessings upon him.
2- Knowing the names and attributes of Allaah, and the effect of these names upon His slaves.
3- Knowing the way to reach Him.
4- Knowing the obstacles that prevent man from knowing this way and the great blessings to which it leads.
5- Knowing yourself in a true sense, and knowing what your soul needs, what is good for it and what is bad for it, and knowing its faults and shortcomings.
These five matters will complete a person’s knowledge. Achieving perfect will power can only be achieved by paying attention to the rights of Allaah over His slaves and fulfilling them sincerely, adhering to that and bearing witness to the blessings of Allaah. These two strengths can only be perfected with the help of Allaah, so man needs Allaah to guide him to the Straight Path to which He guides His close friends. See al-Fawaa’id, p, 18-19.
Once we know that the true religion is the divine support that directs the potentials of man, then we know that religion is also a protective shield for society, because human life can only be strong when there is co-operation among the members of society. This co-operation can only be achieved by means of a system that regulates the relationships between them, defines their duties and protects their rights. This system needs a deterrent that will deter one from transgressing and encourage one to follow the system, one that carries weight in people’s hearts and prevents them from overstepping its limits. What is this authority? I say that there is no power on earth that can match the power of religion in protecting the sanctity of the system, guaranteeing the coherence of society and the stability of its system, and providing the means of peace and security.
The reason for that is that man differs from all other living beings in that his voluntary actions and dealings are governed by something that can be neither seen nor heard, namely the religious belief that disciplines the heart and guides his faculties. Man is inevitably led by his belief, whether it is sound or corrupt. If his belief is sound, everything else will also be sound, but if it is corrupt then everything else will also be corrupt.