That's so funny that you picked that quote. That's my most despised quote too, and absolutely what I would have said. Like I think I twitch a little every time I hear it. It's a thing that a lot of AA people say, only second to "it works if you work it!" Like, not only is it literally not the definition of insanity, but it's also not helpful. Sometimes you do the same thing twice and you do get different results because there are totally different variables and circumstances surrounding you. You know, if at first you don't succeed, try, try, again.

Here's my second least favorite:

Sticks and stones may break my bones, but words will never hurt me.

No, that's stupid. Words can totally hurt you. This is just shitty advice to give to kids. Words can be abusive and powerful. You can defame people, and ruin their lives and careers. You can hurt your partners with words. Sometimes kids get called bad names and then they cry because it hurt and that's totally legitimate. Stop telling your kids that they're not hurt when they are, and telling them that their bad behavior isn't hurting other people when it is. Ya know?