Whenever anyone accuses some person of being 'unfeeling,' he means that that person is just. He means that that person has no causeless emotions and will not grant him a feeling which he does not deserve. He means that 'to feel' is to go against reason, against moral values, against reality.
Reality confronts man with a great many musts, but all of them are conditional the formula of realistic necessity is You must, if and the if stands for man's choice
What you think is an illusion created by your glands, your emotions and, in the last analysis, by the content of your stomach. That gray matter you're so proud of is like a mirror in an amusement park which transmits to you nothing but distorted signals from reality forever beyond your grasp.