There are two aspects of prayer—one is its spirit, i.e. its true inner aspect, and the other its outward ritual aspect. Inner reality is the true essence of prayer, and the outward form is extraneous. But when a group follows the outward form for a long period, it forgets the aforesaid difference. It gradually comes to consider carrying out only the outward formalities, as if they were the real prayer. This means that the group has reached the stage of mental stagnation. Hence, it has been the way of God Almighty that when He sends a new prophet, He makes some changes in his shariah (i.e. outward ritual forms). His purpose is to shake the people out of their inertia, to break their addiction to outward formalities and to make them active and live worshippers in spirit. Now, those who think that outward formality and ritual in prayer are everything, refuse to obey the prophet. On the contrary, those who know the true spirit underlying prayer start to follow the prophet’s instructions. This change infuses a new spirit into their prayers. It removes them from inert and frozen faith and takes them towards active and live faith. This is the wisdom which accounts for the rites of prayer or worship having differed from one prophet to the next. When a prophet introduced new rites, those who were sunk in inertia would raise serious objections to them. But the prophets were instructed not to allow these matters to become the subject of serious discussions and to devote their full attention to the real and basic teachings.