Once you start to feel optimistic, bad things happen
But if you take everything too seriously and pessimistically as if you are a sepulchral and lugubrious being, relatively "good" things that represent so-called serendipitous felicitousness, happen, unfortunately
So you decide to rather not possess any kind of emotions, impressions or predictions for the purpose of not being disappointed again and again whatever things turn out good or bad
Just do your best to stay neutral and don't lean on any perspective of things that happen next
Until you eventually find it difficult to maintain the attitude towards the following things
It's hard to catch a mode to be in a certain state of mind which lets you feel neither optimistic nor pessimistic
It's simply impossible to not think about it and give subjective conceptions about the future things because we inevitably look forward to foreseeing the future, always exploring ways to have a newer and better life all the time and wait for it to come, good or bad
It is from human nature that we greedily want more, wish to improve, evolve to help yourself climb up to the next, higher level
If you care in that aspect of life