1.591–592

“One factor, bhikkhus, when developed and extensively cultivated, leads to the breakthrough to wisdom … to extinction without clinging (grasping/holding on). What one factor? Mindfulness of the body. This one factor, bhikkhus, when developed and extensively cultivated, leads to the breakthrough to wisdom … to extinction without clinging.”

1.593–595

“When one factor is developed and extensively cultivated, there is the penetration of many elements … the penetration of various elements … the discrimination of many elements. Which one factor? Mindfulness of the body. In this, bhikkhus, when the one factor is developed and extensively cultivated, there is the penetration of many elements … the penetration of various elements … the discrimination of many elements.”

1.596–599

“One factor, bhikkhus, when developed and extensively cultivated, leads to the realization of the fruit of stream-entry … once-returner … non-returner … arahantship. What one factor? Mindfulness of the body. This one factor, bhikkhus, when developed and extensively cultivated, leads to the realization of the fruit of stream-entry … once-returner … non-returner … arahantship.”

1.600–615

“One factor, bhikkhus, when developed and extensively cultivated, leads to the acquisition of wisdom … the growth of wisdom … the expansion of wisdom … to great wisdom … to widespread wisdom … to abundant wisdom … to profound wisdom … to extraordinary wisdom … to vast wisdom … to ample wisdom … to quick wisdom … to agile wisdom … to joyful wisdom … to rapid wisdom … to sharp wisdom … to penetrating wisdom. What one factor? Mindfulness of the body. This one factor, bhikkhus, when developed and extensively cultivated, leads to the acquisition of wisdom … the growth of wisdom … the expansion of wisdom … to great wisdom … to widespread wisdom … to abundant wisdom … to profound wisdom … to extraordinary wisdom … to vast wisdom … to ample wisdom … to quick wisdom … to agile wisdom … to joyful wisdom … to rapid wisdom … to sharp wisdom … to penetrating wisdom.”

Training in Mindfulness and Clear Comprehension

"When, Brahmin, a bhikkhu is devoted to wakefulness, the Tathāgata further instructs him: ‘Come, bhikkhu, be endowed with mindfulness and clear comprehension. Be clearly aware when going forward and returning; be clearly aware when looking ahead and looking away; be clearly aware when bending and stretching; be clearly aware when carrying the outer robe, the bowl and wearing robes; be clearly aware when eating, drinking, consuming food, and tasting; be clearly aware when defecating and urinating; be clearly aware when walking, standing, sitting, falling asleep, waking up, speaking, and keeping silent.’

– Excerpt from MN 107: The gradual training guidelines

The Buddha is sharing on maintaining a recollection to be aware as one is interacting with the world. One can gradually practice in training in this way by picking one activity and aiming to maintain awareness during this activity.

Related Teachings:

A regular practice of meditation clears the mind of obstructions - Training in mindfulness in this way can be cultivated once one has built a steady practice of meditating 2x to 3x per day

A Bucket of Rice (SN 3.13) - By practicing sense-restraint, limiting or avoiding indulging in things that build up excitement and applying moderation in eating, one is setting up a base to setting up a regular meditation practice.

The five precepts (AN 8.39) - When one is training in practicing the five precepts, not as rules or commandments, but as guidelines for wise decision making that promotes harmony and limits any harm one is putting out, one is creating conducive conditions to application of sense-restraint and in moderation in eating

Depending on where you’re at with your cultivation, each of these practice areas can be taken up one at a time, as forming of a new habit, that takes 4-6 weeks of frequent, steady practice to build the pathway for this habit to transition from being new and effortful, to becoming easy and second nature.

Read more on the Gradual training and gradual progress: The Habit Curve.