3.
The Discourse on Mental impurities
214.
"Monks, there are these five impurities of gold, by which impurities impure gold is neither soft nor wieldy, nor luminous and is brittle, and does not rightly approach work.
Which five?
Iron, monks, is an impurity of gold, by which impurity impure gold is neither soft nor wieldy, nor luminous and is brittle, and does not rightly approach work.
Copper, monks, is an impurity of gold, by which impurity impure gold, etc.
Lead, monks, is an impurity of gold, etc.
Tin, monks, is an impurity of gold, etc.
Silver, monks, is an impurity of gold, by which impurity impure gold is neither soft nor wieldy, nor luminous and is brittle, and does not rightly approach work.
These, monks, are the five impurities of gold, by which impurities impure gold is neither soft nor wieldy, nor luminous and is brittle, and does not rightly approach work.
"So too, monks, there are these five impurities of the mind, by which impurities impure mind is neither soft nor wieldy, nor luminous and is brittle, and does not rightly become concentrated for the elimination of mental corruptions. Which five? Sensual desire, monks, is an impurity of the mind, by which impurity impure mind is neither soft nor wieldy, nor luminous and is brittle, and does not rightly become concentrated for the elimination of mental corruptions, etc. These, monks, are the five impurities of the mind, by which impurities impure mind is neither soft nor wieldy, nor luminous and is brittle, and does not rightly become concentrated for the elimination of mental corruptions." The third.