At last you have the true foundation of the sadhana. This calm , peace and surrender are the right atmosphere for all the rest to come, knowledge, strength, Ananda. Let it become complete.
   It does not remain when engaged in work because it is still confined to the mind proper which has only just received the gift of silence. When the new consciousness is fully formed and has taken entire possession of the vital nature and the physical being (the vital as yet is only touched or dominated by the silence, not possessed by it), then this defect will disappear.
    The quiet consciousness of peace you now have in the mind must become not only calm but wide. You must feel it everywhere, yourself in it and all in it.

- p9