Do what you will, there is going to be some benevolence, as well as some malice, in your patient's soul. The great thing is to direct the malice to his immediate neighbours whom he meets every day and to thrust his benevolence out to the remote circumference, to people he does not know. The malice thus becomes wholly real and the benevolence largely imaginary.
Your patient must demand that all his own utterances are to be taken at their face value and judged simply on the actual words, while at the same time judging all his mother's utterances with the fullest and most oversensitive interpretation of the tone and the context and the suspected intention. She must be encouraged to do the same to him. Hence from every quarrel they can both go away convinced, or very nearly convinced, that they are quite innocent. You know the kind of thing: "I simply ask her what time dinner will be and she flies into a temper." Once this habit is well established you have the delightful situation of a human saying things with the express purpose of offending and yet having a grievance when offence is taken.
That is why the old religions and the old scriptural language showed so sharp a wisdom when they spoke, not of one's duty towards humanity, but one's duty towards one's neighbour. The duty towards humanity may often take the form of some choice which is personal or even pleasurable. That duty may be a hobby; it may even be a dissipation.