If God does not need our worship and it is we who need it, then why have certain rituals of worship been made obligatory on us? He could have specified the form and left its amount and quantity to us.
The sentiments of thanksgiving and gratitude for the Creator are present within every person. It is these sentiments which give rise to worship. In other words, the urge to worship the Almighty is naturally found in every person. The nature of this urge is such that if it is not disciplined, it might cause great imbalance: Man is prone to extremes. In the absence of any stipulated amount of worship, he would have either ended up doing too little or would have gone to such extremes as monasticism. To both these, history bears ample witness.