No matter how sharp it is, a knife will never cut it’s own handle.
More Vietnamese Proverbs:
Elephants are killed for their ivory, birds for their feathers.Vietnamese
Receive a plum, return a peach.
Vietnamese
When eating the fruit, think of the person who planted the tree.
Vietnamese
The chained buffalo doesn't enjoy grazing.
Vietnamese
Even if a mountain is high, there is always a way to reach the top -- and although the way might be full of danger, there is always a way for someone to get through it.
Vietnamese