You know what they do not know.

Realisation that Allah knows all, hears all and sees all that we do is one of the most important aspects of Allah's nature that a Muslim can benefit from. "Fear Allah as if you can see Him, if you cannot imagine seeing Him, know that He sees you." Allah sees everything that we do and so we should be faithful in our duties even when we are alone. For those who have a very high realisation of the nature of Allah, they do not worship him for the fear of His hell, nor for the want of His paradise but because Allah is worthy of all praise.Subhanallah.