30.Why don't you believe in pessimistic predictions

30.Why don't you believe in pessimistic predictions?
I'm a person who doesn't really believe in short-term forecasts myself. The reason is very simple. Who can predict the uncertainty of the world?
If it's an optimistic forecast, I'd like to take a look at it, because the optimistic forecast is at least analyzing opportunities, and another side benefit is that it can at least give some confidence.
And pessimistic prediction, in addition to affect the mood, let us timid, stop positive action, nothing good.
For example, at the end of last year, there was a saying that "2019 is the worst year in the past 10 years, but it is also the best year in the next 10 years", which means that the future is not as good as one year.
This remark is clever and witty, and it also hit the pessimistic psychology of some people, so it spread widely.
But recently, I saw a paragraph saying: "it is clear that as long as a person believes and spreads such words, he will surely be worse tomorrow. If your expectation is bad, your realization will be bad. A person's mental health is reflected in being able to resist the pollution of these words.
为什么别相信悲观预测？
我自己是一个不怎么相信短期预测的人。道理很简单，世界的不确定性那么大，谁能预测得了呢？
那如果是乐观的预测，我还看一看，因为乐观的预测，至少是在分析机会，另外一个附带的好处是，至少还能给点信心。
而悲观的预测呢，除了影响心情，让我们缩手缩脚，停止积极行动之外，什么好处也没有。
就比如去年年末的时候，有一段话是传来传去，说“2019年是过去10年最坏的一年，但也是未来10年最好的一年”，意思是未来是一年不如一年。
这话说得机灵、俏皮，也切中了一些人悲观心理，所以传得很广。
但是最近我看到一段话，说：“可以明确的是，只要一个人信了，传播了这类话，他的明天肯定会要差一些。你预期差，实现自然差。一个人的精神健康，体现为能够抵抗这些话的污染。”
重点词汇
believe in 相信 ; 信任 ; 信奉，信仰
take a look at 看一看 ; 览
in addition to 另外，加之，除…之外
For example 例如;比如
at the end of 在…末端 ; 在…的结尾
in the past 在过去