6.
The Discourse on Perception
327.
At Sāvatthī.
"Whatever, monks, desire and lust there is for perception of material form, that is an impurity of the mind.
Whatever for perception of sound...
whatever for perception of odour...
whatever for perception of flavour...
whatever for perception of tangible object...
whatever desire and lust there is for perception of mental phenomena, that is an impurity of the mind.
When, monks, for a monk... etc.
for phenomena to be realised by direct knowledge."
The sixth.