Mother said she would try to make you see her because it is not always easy for people to see her even when she is near them.
It is also easier to see with eyes shut than with eyes open — though this too is possible — because it is a sight within you that has to open in order to see her. It is not necessary to call her for any fixed number of hours. It is enough if you love her always, remember her often, sit every day a little time before her photograph and call her.
You must never doubt that Mother loves you and you need never weep for that, for her feelings towards you cannot and will not change.
Ref: The Mother with Letters on The Mother