The second half of this sentence seems easier to understand: a word is more important than a hundred gold, which means that a word is heavier than a lot of gold, and a lot of gold becomes very light in front of a word; The previous sentence means "from ancient times to the present", and "in the letter" means "in the letter". The key to understanding this sentence lies in "expelling people". Wang Anshi means that as a leader from ancient times to the present, if you want to drive the people, you must be honest and clean. Everything you say is more important than anything. How much gold is so light in front of what you say.
I'm doing a task. If you are satisfied, give me the best answer. Thank you, hehe. . . . . .