The Buddha’s pointing your attention to how the way you breathe is going to have an impact on your mood. So it’s wise to get sensitive to this aspect of your experience, to get more and more sensitive to how you really are shaping things.
"So follow the Buddha’s instructions. Try to get sensitive to how the way you breathe has an impact on the body, and use the breath in a way that feels soothing, gives rise to feelings of pleasure, gives rise to feelings of refreshment. When the body’s been energized, then you can allow it to grow calm. At the same time, look at the perceptions you’re holding in mind right now. What kind of perception do you have of the breath? If you think of it simply as air coming in and out through the nostrils, it’s going to be hard to use the breath to help spread those feelings of ease and well-being around the body. But if you think of the breath as a flow of energy, it’ll be easier. After all, the muscles have to move, the body has to move so that the air can come in and out of the lungs — well, what is that movement? It’s breath energy. Where does it come from? Where does it originate in the body? And as you feel that movement spreading through the body, does it feel good or does it feel...