If the deed practiced by the worshipper is understood at all its dimensions...
If the deed practiced by the worshipper is understood at all its dimensions, clear in its wisdom and benefit in all details, the element of submission and yielding gets minimized, and it will be dominated by motives of interest and benefit, no more a worship of God as much as it is a deed of benefit practiced by the worshipper so that he might derive advantage out of it, benefiting of its results.
Just as the spirit of obedience and attachment in the soldier grows, getting deepened through military training, by giving him orders and requiring him to perform them with obedience and without discussion, so does the feeling of the worshipping person grow and get deepened in its attachment to his Lord through requiring him to practice these rites in their unseen aspects with submission and yielding.
For submission and yielding require the assumption of the existence of an unseen aspect and the attempt not to question this unseen aspect of worship. Demanding its interpretation and limitation of interest means stripping worship of its reality-as a practical expression of submission and obedience- and measuring it by measurements of benefit and interest like any other deed.
We notice that this obscurity is almost ineffective in rites representing a great general interest, one that conflicts with the personal interest of the worshipper, as is the case with Jihad which represents a great general interest which contrasts the desire of the person performing it to preserve his life and blood, and also in the case of Zakat which represents a great interest which contrasts the strong desire of the person paying it to preserve his wealth and property.
The issue of Jihad is very well understood by the person performing it, and the issue of Zakat is generally understood by the person who pays it; neither Jihad nor Zakat thus loses any element of submission and obedience (to God), for the difficulty of sacrificing life and property is what makes man's acceptance of a worship-for which he sacrifices both life and property-is indeed a great deal of submission and obedience.
Add to this the fact that Jihad and Zakat and similar rites are not meant to be merely aspects of upbringing just for the individual, but also for the achievement of social benefits secured thereby. Accordingly, we observe that obscurity is highlighted more and more in rites dominated by the educating aspect of the individual, such as prayer and fasting.