Ha ha, famous sayings. Famous sayings don't seem to be powerful enough. They are far less impressive than popular sayings, but I'll find some for you:

Don't be close, don't be human; You can't be a son if you don't follow your parents.-Mencius

has no father and no gentleman, but is an animal.-Mencius

An unfilial person is the most hateful person in the world.-Lu Xun

Losing a loving mother is like putting a flower in a bottle, although it still has color and fragrance, but it has lost its root.-Lao She