Answer:
"If the injustice is part of the necessary friction of the machine of government, let it go, let it go: per-chance it will wear smooth,-certainly the machine will wear out. If the injustice has a spring, or a pulley, or a rope, or a crank, exclusively for itself, then perhaps you may consider whether the remedy will not be worse than the evil; but if it is of such a nature that it requires you to be the agent of injustice to an-other, then, I say, break the law."
"It is not a man's duty, as a matter of course, to devote himself to the eradication of any, even the most enormous wrong; he may still properly have other concerns to engage him; but it is his duty, at least, to wash his hands of it, and, if he gives it no thought longer, not to give it practically his support. If I devote myself to other pursuits and contemplations, I must first see, at least, that I do not pursue them sitting upon another man's shoulders."
Explanation:
An aphorism, according to Merriam-Webster, is "a concise statement of principle." Henry David Thoreau is well known for his book, Walden and his essay "Civil Disobedience," was very fond of using aphorism in his essays.