Never interrupt your enemy ...

Never interrupt your enemy when he is making a mistake.
Never interrupt your enemy when he is making a mistake.

More phrases

If one does not know to which port one is sailing, no wind is favorable.
What a distressing contrast there is between the radiant intelligence of the child and the feeble mentality of the average adult.
We are masters of the unsaid words, but slaves of those we let slip out.
I have always found that mercy bears richer fruits than strict justice.
A lie gets halfway around the world before the truth has a chance to get its pants on.

Quotes from the same author

He who fears being conquered is sure of defeat.
The best cure for the body is a quiet mind.
Imagination rules the world.
Take time to deliberate, but when the time for action has arrived, stop thinking and go in.
The truest wisdom is a resolute determination.