Proverbs

I learned English proverbs from my teacher in my school, so I'd like to introduce it which I like.
1. Don’t cry over spilt milk.
It gives me courage! It means when regretting something, you shouldn't complain it; you should try to do again!
If we fail tests or any kind of stuff, we often complain about not ourselves but others, but it’s not a good way. The most important thing is never give up!!
2. When in Rome,do as the Romans do.
It means if you're in Rome, you must obey as the Roman’s rule, culture and lifestyle.
3. Make hay while the sun shines.
It means you mustn't miss a golden opportunity. [Grasp the opportunity!]
I think if we just wait happiness, we cannot get the chance! If we want to be happy, we must try to do! Don’t hesitate! Believe in yourself!
4. Don't count your chickens before they're hatched.
We tend to plan something, even if we haven't success yet...uh, it's difficult to explain it!
5. Do as you would be done by.
It's very important proverb, I think. It means [do to others as you would have them do with you.] Lately, I often heard very sad news like indiscriminate murder in Akibahara. I think we have been deteriorating our morals and human nature.