Answer:
This quote is expressing the idea that throughout history, certain fundamental principles of right and wrong have remained constant, even as opinions, customs, and belief systems have changed over time. The "moral law" is described as being written on "the tablets of eternity," suggesting that it is timeless and unchanging. The quote also suggests that there are consequences for behaving in ways that are dishonest, unjust, or immoral, and that these consequences will inevitably be paid, regardless of the passing of time. In other words, the quote is emphasizing the importance of living according to a moral code and treating others with respect and kindness, because these values are enduring and essential to a well-ordered society.