Hidden corruption made manifest

There is the case of a man minding his own business, sitting at peace and quiet; and when a brother comes up and says an annoying word to him, he is put out by it.  And from the circumstances he thinks that he is justifiably angered, and he speaks against the one who troubled him, saying, ‘If he had not come and spoken to me and annoyed me I should not have been at fault.’  This is a delusion:  this is false reasoning!  It was not the one who spoke that put him in a bad mood.  He only showed that it already existed in him; so that he could, if he chose, make reparation for his fault.  But the man referred to above is like clean-looking winter wheat, externally good and ready to use; but when someone crushes it, its corruption is revealed.  He was sitting at peace but he had this anger inside him and he did not know it.  One word to him from other and the corruption hidden inside him leapt out.