Which sentence in this excerpt from henry david thoreau's "civil disobedience" implicitly argues that people need to think independently and question authority?

1.i believe that the state will soon be able to take all my work of this sort out of my hands, and then i shall be no better a patriot than my fellow-countrymen.
2. seen from a higher still, and the highest, who shall say what they are, or that they are worth looking at or thinking of at all?
3. however, the government does not concern me much, and i shall bestow the fewest possible thoughts on it.
4. if a man is thought-free, fancy-free, imagination-free, that which is not never for a long time appearing to be to him, unwise rulers or reformers cannot fatally interrupt him.