A brief anecdote: in college, one of the readings was Tacitus, famous to the point of eponymy for his disinterested style. But when he described the suicide of Cato, I could feel the intestines in my hands, and the strength it took to tear them apart. The only way to reach this point, however, was to understand his situation. Knowledge first, then sympathy. For one thing, that order allows us to make judgments more justly. A person may be suffering, but that's not enough information to make a decision to help or hinder them. We must know the cause and the ground.