A Pot
Kumbha Sutta  (SN 45:27)

At Sāvatthī. “Monks, just as a pot without a stand is easy to knock over, but if it has a stand is hard to knock over; in the same way, the mind without a stand is easy to knock over, but if it has a stand is hard to knock over.

“And what is the mind’s stand? Just this noble eightfold path, i.e., right view, right resolve, right speech, right action, right livelihood, right effort, right mindfulness, & right concentration.

“Just as a pot without a stand is easy to knock over, but if it has a stand is hard to knock over; in the same way, the mind without a stand is easy to knock over, but if it has a stand is hard to knock over.”

See also: SN 45:8