The mystic always consults his breath, in the evening and in the morning, to know whether it is harmonious with the sun, with the moon and the planets. He is always conscious of the breath. For this the Sufi gives a lesson, to be always conscious of the breath. This is called "Fikr." My spiritual teacher, my murshid, once said, "People say that there are many sins and virtues, but I think there is only one." I asked, "What is that?" He said, "To let one breath go without being conscious of it." This is done by concentration.