Ask no questions and hear no lies.
More French Proverbs:
Every one feels his own burden heavy.French
He that would keep his house clean must not let priest or pigeon into it.
French
Wake not a sleeping cat.
French
There once was a good mother-in-law but the wolf gobbled her up.
French
Cabbage for cabbage.
French
War makes robbers, and peace hangs them.
French