As usual the first to post... hee hee.. sorry.. promised to gif way to u, but this time it's u who started it, so mi turn to haf my say...
I dun think it is possible to be happy always. But we can try to make most of our lives a happy one. Face wif a problem?? not easy to be happy at first, but if u choose to be happy becoz u are going to take up a challenge, and learn things from it, u will be happy to tackle the problem too.
I dun think it's unhealthy to be happy all the time. But I think it's good to feel sad, angry and envious at times too. Becoz we are bestow wif these feelings when we are born. Having to experience these kind of feelings will make me feel that u r more human. If not, u will like rather like one of those poor spastic children. Unable to understand one's own feelings. Dunno wat is sad when ur gf/bf leaves u. Not to mention worse things that could happen, like deaths. Feeling angry, will bring out this fighting spirit in u, telling pple not to bully u.. it's good. Being jealous means u care for someone u love. For instance, if someone whom u love is being taken away from u, feeling a tinge of jealousy prove much much the person is in ur heart.
I would say that showing a bit of anger, depression and jealousy is a good sign, but most importantly when it comes to Happiness.. pls dun be too stingy, becoz only a smile from u can repay the smile given to u. If not that latter will haf a bad day, becoz he has failed to bring joy to u. SMILE PPLE!!!!

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