8.
The Discourse on the Buddha
820.
"Monks, there are these four bases for spiritual power.
Which four?
Here, monks, a monk develops the basis for spiritual power that possesses concentration due to desire and volitional activities of striving, concentration due to energy, etc.
concentration due to mind, etc.
develops the basis for spiritual power that possesses concentration due to investigation and volitional activities of striving.
These, monks, are the four bases for spiritual power.
Because of having developed and cultivated these four bases for spiritual power, monks, the Truth-finder is called 'the Worthy One, the Perfectly Enlightened One.'"
The eighth.