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an.1.593-595 Aṅguttara Nikāya (Numbered Discourses)

What one thing?
Mindfulness of the body.
593–595
“When one thing is developed and cultivated there is the penetration of many elements … the penetration of diverse elements … the analysis of many elements.
When this one thing is developed and cultivated there is the penetration of many elements … the penetration of diverse elements … the analysis of many elements.”