In the most physical things you have to fix a programme in order to deal with time, otherwise all becomes a sea of confusion and haphazard. Fixed rules have also to be made for the management of material things so long as people are not sufficiently developed to deal with them in the right way without rules. But these things of which you write are different; they are concerned with your inner development, your sadhana. In fact, even in outward things the Mother does not plan with her mind and make a mental map and rule of what is to be done; she sees what is to be done in each case and organises and develops it according to the nature of each case. In matters of the inner development and the sadhana, it is still more impossible to map out a plan fixed in every detail and say, “Every time you shall step here, there, in this way, on that line and no other.” Things would become so tied up and rigid that nothing could be done; there could be no true and effective movement.
Ref : The Mother with Letters on The Mother