Where there's smoke, there's fire. Beggars can't be choosers. A plethora of individuals with expertise in culinary techniques vitiate the potable concoction produced by steeping certain comestibles. 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. He who laughs last laughs best. Nothing ventured, nothing gained.