Answer:
What Finney is saying is that, if legislation is made by the government based on underlying moral principles (he refers to this moral principles as moral law), then, said legislation is as valid as the moral principles than inspired them.
For this reason, citizens are obliged to respect the legislation, because this act is equivalent to acting under one's own moral principles.
a song that is associated with a movement for social change and hence part of ... Songs which support the status quo do not qualify as protest songs
Democratic government is the answer to your question
Interchangeable parts, I hope this helps you