Watch the sequence of events: Breathing. Breathing. Distracting thought arising. Frustration arising over the distracting thought. You condemn yourself for being distracted. You notice the self-condemnation. You return to the breathing. Breathing. Breathing. It's really a very natural, smooth-flowing cycle, if you do it correctly. The trick, of course, is patience. If you can learn to observe these distractions without getting involved, it's all very easy. You just glide through the distraction, and your attention returns to the breath quite easily.