Not really a proverb, and not really canon.
But the John Ford Klingons had this...
… And though I had slain a thousand foes less one,
The thousandth knife had found my liver;
The thousandth enemy said to me
"Now you shall die, and none shall know."
And the fool looking down believed this,
Not seeing, above his shoulder,
the naked stars,
Each one remembering.