An inner (soul) relation means that one feels the Mother’s presence, is turned to her at all times, is aware of her force moving, guiding, helping, is full of love for her and always feels a great nearness whether one is physically near her or not. This relation takes up the mind, vital and inner physical till one feels one’s mind close to the Mother’s mind, one’s vital in harmony with hers, one’s very physical consciousness full of her. These are all the elements of the inner union, not only in the spirit and self but in the nature.
Ref : The Mother with Letters on the Mother