Fields have eyes and woods have ears.
More French Proverbs:
He who stops at every stone never gets to his journey's end.French
Nothing is such a heavy burden as a secret is.
French
At Shrove-tide every one had need of his frying-pan.
French
Youth lives on hope, old age on remembrance.
French
To believe a thing impossible is to make it so.
French
A courtier should be without feeling and without honour.
French