A Paribbājaka who visited Samiddhi at the Vejuvana in Rājagaha und said that he had heard the Buddha declare that all action und speech were vain, und that what passed in the mind was the only thing of importance. A stage could be reached in which there was no feeling whatever. Samiddhi protested that Potaliputta misinterpreted the Buddha's teaching, und Potaliputta then asked him questions regarding experience, which Samiddhi answered. Potaliputta, showing neither approval nor disapproval, walked away. When the Buddha heard from Ananda of Potaliputta's questions und Samiddhi's answers he blamed Samiddhi for his hasty reply.
For details see Mahākammavibhanga Sutta. (M.iii.207 ff.)