That is the right religion, but most men do not know 'even this fact' (Surah ar-Rum, 30:30)

The spiritual traveler should be single minded and well-intentioned. The objective of his spiritual journey should be nothing but to pass away in Allah. 

The Qur'an says: "Worship Allah keeping worship purely for Him."

A number of reports say that there are three grades of intention. 

Imam Sadiq is reported to have said: "There are three kinds of worshippers: There are some who worship Allah because they are afraid of Him. Their worship is that of the slaves. There are some others who worship Allah for the sake of recompense. Their worship is that of the wage-earners. There are till others who worship Allah because they love Him. Their worship is that of freemen."

On deep thinking it appears that there are two kinds of worship. One of them is not worship at all in the right sense, because those who perform this kind of worship are actually self-worshippers. They are motivated by self-interest. As self-worshippers cannot be the worshippers of Allah, they may even be regarded as a sort of unbelievers.

The Qur'an has described the worship of Allah as man's nature. At the same time it has denied the possibility of any change in man's in-born qualities.

Set your purpose for religion as a man by nature upright - the nature in which Allah has created man. There is no altering in the nature framed by Allah. 

That is the right religion, but most men do not know 'even this fact' (Surah ar-Rum, 30:30)