When the grossness of your in-and-out breathing has ceased, subtle in-and-out breathing arises. This very subtle breath is your mind’s object of focus. This is the sign of concentration. This first appearance of a sign-object will be replaced by a more and more subtle sign-object. This subtlety of the sign can be compared to the sound of a bell. When a bell is struck with a big iron rod, you hear a gross sound at first. As the sound fades away, the sound becomes very subtle. Similarly, the in-and-out breath appears at first as a gross sign. As you keep paying bare attention to it, this sign
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