This is a curious rule and it took me a long time to learn because in fact at the beginning of my practice I felt the opposite.Professionalism required that you didn’t particularly like the people that you worked for or at least maintained an arms length relationship to them, which meant that I never had lunch with a client or saw them socially.
Then some years ago I realized that the opposite was true. I discovered that all the work I had done that was meaningful and significant came out of an affectionate relationship with a client. And I am not talking about professionalism; I am talking about affection. I am talking about a client and you sharing some common ground. That in fact your view of life is someway congruent with the client, otherwise it is a bitter and hopeless struggle.