not need to be told twice

what doesn't kill you makes you stronger

enough is as good as a feast; you can have too much of a good thing

don't change a winning team; if it ain't broke, don't fix it

One must let sleeping dogs lie

you've got to crack a few eggs to make an omelette

even Homer nods, it's a good horse that never stumbles

(informal, figuratively) not to see something which is obvious, right under one's nose; to be dim-sighted because one is hungover and half-asleep; to be bleary-eyed

there's no accounting for taste

don't look a gift horse in the mouth