Smith distinguishes with great sophistication the different kinds of reasons people have in taking an interest in the lives of others, separating out sympathy, generosity, public spirit and other motivations. Even though he acknowledged the role of mental attitudes and predispositions, he went on to discuss how reasoning, which is at the heart of rationality, must have a big role in preventing us from being – consciously or unconsciously – too self-centred, or thoughtlessly uncaring.