 The experience in question is of the reality of the public affection in our nature, the immediate object of which is the good of others, and the reality of the moral sense by which we are determined to approve such affections. This moral sense, of whose workings we are all aware, is the faculty by which, without the mediation of rational activity, we approve of virtuous acts and disapprove of vicious ones; and the approval and disapproval rise up in us without any regard for self-love or self-interest. In a very Hutchesonian way Turnbull invites us to consider the difference we feel when faced with two acts which are the same except for the fact that one of them is performed from love of another person and the other act is performed from self-interest. These facts about our nature have to be accommodated within moral philosophy just as the fact that heavy bodies tend to fall has to be accommodated within natural philosophy.