‘Venerable Nāgasena, those two qualities of medicine you say he ought. to take, which are they?’

‘Just, O king, as vermin are not produced in medicine; just so, O king, should no evil dispositions be allowed to arise in the mind of the strenuous Bhikshu, earnest in effort. This, O king, is the first of the qualities of medicine he ought to have.

‘And again, O king, just as medicine is an antidote to whatever poison may have been imparted by bites or contact, by eating or by drinking in any way; just so, O king, should the strenuous Bhikshu, earnest in effort, counteract in himself the poison of lusts, and malice, and dullness, and pride, and wrong belief, This, O king, is the second of the qualities of medicine he ought to have. For it was said, O king, by the Blessed One, the god over all the gods:

“The strenuous recluse who longs to see
Into the nature, and the meaning true,
Of the constituent elements of things,
Must as it were an antidote become,
To the destruction of all evil thoughts.”’