That you cannot force the other person to change, so don't go into a relationship thinking you can try to change that person because in the end, the only thing you can change is you.
I`m selfish, impatient, and a little insecure. I make mistakes, I am out of control, and at times hard to handle, but if you can't handle me at my worst, then you sure as hell don't deserve me at my best. - Marilyn Monroe