When we practice active concentration, we welcome whatever comes along. We don’t think about or long for anything else. We just dwell in the present moment with all our being. Whatever comes, comes. When the object of our concentration has passed, our mind remains clear, like a calm lake. When we practice “selective concentration,” we choose one object and hold onto it. During sitting and walking meditation, whether alone or with others, we practice. We know that the sky and the birds are there, but our attention is focused on our object. If the object of our concentration is a math problem,
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