The road to hell is paved with good intentions. The exception proves the rule. Frankly, I've never understood this proverb. Scientifically speaking, an exception should cast doubt on the validity of a so-called rule. Le temps, c'est de l'argent.
Time is money.
Qui a bu boira. You can't teach an old dog new tricks, or a leopard can't change his spots. People CAN change. Le mieux est l'ennemi du bien. The best is enemy of the good.