I have heard that on one occasion a certain monk was dwelling among the Kosalans in a forest thicket. Now at that time, he spent the day's abiding thinking evil, unskillful thoughts: i.e., thoughts of sensuality, thoughts of ill will, thoughts of doing harm.

Then the devata inhabiting the forest thicket, feeling sympathy for the monk, desiring his benefit, desiring to bring him to his senses, approached him and addressed him with this verse:

From inappropriate attention
you're being chewed by your thoughts.
Relinquishing what's inappropriate,
	contemplate
	appropriately.

Keeping your mind on the Teacher,
the Dhamma, the Sangha, your virtues,
	you will arrive at
	joy,
	rapture,
	pleasure
	without doubt.

Then,	saturated
	with joy,
you will put an end
to suffering & stress.

The monk, chastened by the devata, came to his senses.


See also: any of the suttas on the six recollections (e.g., SN 11.3, AN 3.70, AN 11.12, AN 11.13); passage 36 in Wings to Awakening; "The Ten Recollections" (Study Guide).