He will be moved to action by a natural impulse. That is, its natural growth will result in full-fledged ren benevolence. The other seed-virtue pairs seem to work in the same way, but are not as elaborately illustrated. They thus leave some question about their interpretation. The second suggests a cultural view of morality.
Morality arises from the social sense of shame.
Our natural impulse to conform to public standards, the desire to be well-thought of and avoid criticism or disgrace is the source of morality. If it is the latter, then it would turn out that not only high principles, but considerable detail of one's morality would be technically innate or natural and should be alike in people of all cultures. The third pair raises similar problems. He needs for the detail of li ritual to be pre-social. Otherwise, Mozi can agree with him and continue his quest to reform the social rituals that we absorb out of the natural impulse to respect or courtesy.