AN 2.19
II,ii,9
Kusala Sutta: Skillful
translated from the Pali by
Thanissaro Bhikkhu

"Abandon what is unskillful, monks. It is possible to abandon what is unskillful. If it were not possible to abandon what is unskillful, I would not say to you, 'Abandon what is unskillful.' But because it is possible to abandon what is unskillful, I say to you, 'Abandon what is unskillful.' If this abandoning of what is unskillful were conducive to harm and pain, I would not say to you, 'Abandon what is unskillful.' But because this abandoning of what is unskillful is conducive to benefit and pleasure, I say to you, 'Abandon what is unskillful.'

"Develop what is skillful, monks. It is possible to develop what is skillful. If it were not possible to develop what is skillful, I would not say to you, 'Develop what is skillful.' But because it is possible to develop what is skillful, I say to you, 'Develop what is skillful.' If this development of what is skillful were conducive to harm and pain, I would not say to you, 'Develop what is skillful.' But because this development of what is skillful is conducive to benefit and pleasure, I say to you, 'Develop what is skillful.'"

See also: DN 12 ; SN 6.1 .