A wise man doesn't need advice, and a fool won't take it. Advice when most needed is least heeded. Always in a hurry, always behind. Cheap is dear in the long run. Cut off one's nose to spit one's face.
Empty vessels make the most noise.
Facts do not cease to exist because they are ignored. Fools rush in where angels fear to tread. If the cap fits, wear it. In one ear and out the other. It can't happen here is number one on the list of famous last words.