This shows that the mind can live a fuller life by what I call full breath. For a Sufi, therefore, breath is a key to concentration. The Sufi, so to speak, covers his thought under the breath. This expression of Rumi's I would interpret that the Sufi lays his beloved ideal in the swing of the breath. I remember my Murshid's saying that every breath which is inhaled with the consciousness of the Divine Beloved is the only gain, and every breath inhaled without this consciousness is the only loss there is.