Natalie-favourite quote

Hmmm... so many quotes to pick from the internet... But the quote I most find meaning in would be "Don't cry over spilt milk,and don't laugh either". I created the second part on my own. E.g. You failed in your Maths exam,and was very depressed.You often turn away from people,thinking that they will  make fun of you but all you have to do is revise harder! However,if you laugh,thinking that you will get full marks in the next exam,your teacher will most probably scold you even more ! It's a lose-lose situation if you pick either route(I don't think anybody will fail their exams). I've heard this quote for nearly a thousand times now and I think this quote is very meaningful.Hope all of you out there will like this quote too.