To do something for the Lord is to give Him something of what one has, or of what one does, or of what one is. That is to say, to offer to Him one part of our goods or all of our possessions, to consecrate to Him one part of our work or all our activities, or to give ourselves to Him totally and without reserve so that He may take possession of our nature in order to transform and divinise it.
Ref: Words of The Mother – I