The best-laid schemes of mice and men gang aft agley.
More French Proverbs:
The weakest must hold the candle.French
The devil often lurks behind the cross.
French
When the Frenchman sleeps the devil rocks him.
French
A little absence does a lot of good.
French
To one who has a pie in the oven you may give a bit of your cake.
French
Better alone than in bad company.
French