4.
The Discourse on Non-Impurities
215.
"Monks, these seven factors of enlightenment are without obstruction, without hindrance, are not impurities of the mind; when developed and cultivated, they lead to the realisation of the fruit of true knowledge and liberation.
Which seven?
The enlightenment factor of mindfulness, monks, is without obstruction, without hindrance, is not an impurity of the mind; when developed and cultivated, it leads to the realisation of the fruit of true knowledge and liberation. Etc.
The enlightenment factor of equanimity, monks, is without obstruction, without hindrance, is not an impurity of the mind; when developed and cultivated, it leads to the realisation of the fruit of true knowledge and liberation.
These, monks, are the seven factors of enlightenment which are without obstruction, without hindrance, are not impurities of the mind; when developed and cultivated, they lead to the realisation of the fruit of true knowledge and liberation."
The fourth.