When a thought arises that’s strong enough to take your attention away from the breath, simply note it as not breath. Whether it’s the most beautiful thought in the world or the most terrible, one you would never disclose to another soul, in this meditation, it’s simply not breath. You don’t have to judge yourself. You don’t have to get lost in making up a story about what triggered the thought or its possible consequences. All you have to do is recognize that it is not a thought. Some of your thoughts may be tender and caring, some may be boring and banal; all that matters is that they are not the breath. See them, recognize them, very gently let them go, and bring your attention back to the feeling of the breath.

Sharon Salzberg, Real Happiness: The Power of Meditation