(2) Mom was right: bullies are mean to you because they don't like / are scared of / are insecure about / themselves.
(3) It takes one to know one. Ouch! But it's true! Often the things that just drive us up the wall about other people are the very things we're noticing in ourselves. (This is also what I use to put people at ease when they're concerned I'm analyzing them. "What? Are you serious? I'm in mental health because I RECOGNIZE! ;)). And just as my emoticon suggests, sometimes I do wink.
(4) This, too, shall pass.
It (probably) will (if we work at letting go).
(5) The journey of a thousand miles begins with a step / You'll never know unless you try. Well, we have to start somewhere, and starting somewhere means shelving fear. Easier said than done (another one!), right?
There are more, of course. And there are some that I find horribly untrue. And there are idioms that just drive me bat crazy (E.g.: "I'm not gonna' lie." Really? Somebody suggests in the normal course of events they would, in fact, lie?). Shoes shares in my distaste of junk language. His least favorites are "whatnot" and the misuse of "Literally" (E.g.: "I literally died!" Shoes says, "No you didn't.").
Your language peeves? Favorite or least favorite cliches? Things you find yourself saying that your parents said?