Would you tell me the difference? I believe superstitions. I believe in superstitions. I believe （clause). I believe in ( noun). I understand like above. Some dictionaries say we can use both, but there are slight defferent in their meanings Please tell me how to use different.

Please check my essay,"The role of cell phones in today's society" Cell phones are now beyond the phones. They have a precious value as a communication tool. They are inevitable for everyone, but need some rules to make a good use of them. Firstly, they have their own etiquette. We cannot rely on its convenience.When we send mails through cell phones, we should take care of using picutres or special abbreviations.Sometimes it seems too frank to use them. But with good manners, their quickness and usefulness are helpful. Secondly, as they are ubiquitous, we tend to addict to them. Some young people can't live without cellphones. And if they aren't cautious enough to settle reasonble price contracts, the costs will be too expensive while you don't notice. Thirdly, they have given changes in communication styles. As in Japan, universty students need to apply for the job openings by cell phones. They are really convenient, but on the other hand,communicating only by cell phones causes the lack of face-to-face communication. In conclusion, cell phones have two faces--good or bad. We have to understand this polarlization and use them cleverly.