What does it mean that a thousand dollars can't buy a filial piety?

"A thousand dollars can't buy a filial piety" is an idiom, which means to describe the preciousness and unworthiness of filial piety with things that can't be measured and bought, such as wealth and money. This idiom means that no matter how rich wealth and considerable money, you can't buy true filial piety. Filial piety is priceless, not bought with money, but expressed by children's sincere concern and selfless dedication to their parents.