If you want to correct your brother when he is doing wrong or to punish him, you must try to keep yourself calm; otherwise you yourself may catch the sickness you are seeking to cure and you may find that the words of the Gospel now apply to you: 'Physician, heal yourself (Luke 4:23), or 'Why do you look at the speck of dust in your brother's eye, and not notice the rafter in your own eye?' (Matt. 7:3).