Still water runs dirty and deep.
More Traditional Proverbs:
The world belongs to the shameless.Traditional
The tongue of a poet is always the last to be corrupted
Traditional
Mackerel sky and mares' tails make lofty ships carry low sails.
Traditional
Drive it into the ground.
Traditional
Act with kindness but do not expect gratitude.
Traditional
If a pot is cooking, the frienship will stay warm
Traditional