Knowing Allah Almighty is the first duty and the greatest one.It clarifies the path of life and it’s the most efective in the human manner.In spite that it is from the axioms but when contemplating in heart conditions,psychological determinations and practical actions we found that we are in great need to repeat and slow down talking about this matter.As the fact reveal the weakness of adherence to Allah and the strength of adherence to other things.Also it reveal pshcological emotions driving the person to the right and the left away from what Allah desires.We can see also sins performed,prohibitions violated and corruption propagated.Hence where is the greatest duty?Where is its status in the hearts?Where is its effect in sayings,deeds and conditions?