He determines to consider, by way of psychological analysis, the ideas and sentiments of every kind called up by the spectacle of human actions; and first he notes actions that please and displease the senses, or in some way affect our interest: those that are agreeable and useful we naturally choose, avoiding the opposites, and in this we are _prudent_. But there is another set of actions, having no reference to our own personal interest, which yet we qualify as good or bad. When an armed robber kills and spoils a defenceless man, we, though beholding the sight in safety, are at once stirred up to disinterested horror and indignation. This is no mere passing sentiment, but includes a two-fold judgment, pronounced then and ever after; that the action is in itself bad, and that it ought not to be committed. Still farther, our anger implies that the object of it is conscious of the evil and the obligation, and is therefore responsible; wherein again is implied that he is a free agent. And, finally, demanding as we do that he should be punished, we pass what has been called a judgment of merit and demerit, which is built upon an idea in our minds of a supreme law, joining happiness to virtue and misfortune to crime. The analysis thus far he claims to be strictly scientific; he now proceeds to vary the case, taking actions of our own. I am supposed entrusted by a dying friend with a deposit for another, and a struggle ensues between interest and probity as to whether I should pay it. If interest conquers, remorse ensues. He paints the state of remorse, and analyzes it into the same elements as before, the idea of _good_ and _evil_, of an _obligatory law_, of _liberty_, of _merit_ and _demerit_; it thus includes the whole phenomenon of morality. The exactly opposite state that follows upon the victory of probity, is proved to imply the same facts.