How does Thoreau explain the moral need from civil disobedience? what principles does he use to justify his claim?

 The lesson conveyed from civil disobedience is that a person's principles should never be compromised even when the Government orders them to and also to follow what your conscience tells you to do. Thoreau used the concept of his arrest as principles to justify the moral need from civil disobedience.Which is that Thoreau declined to pay the tax and so, he was arrested and jailed.He was supposed to remain in jail until a fine was paid which he also declined to pay, but was released after only one night.