You can't teach an old dog new tricks. A watched pot never boils Necessity is the mother of invention All that glitters is not gold. Where there's smoke, there's fire. Too many cooks spoil the broth. Charity begins at home.
Dead men tell no tales.
People who live in glass houses shouldn't throw stones. All work and no play makes Jack a dull boy. A rolling stone gathers no moss. It's always darkest before the dawn Sticks and stones can break my bones, but words will never hurt me. Fools rush in where angels fear to tread.