Optimism describes an attitude.  When you feel hopefulness and confidence about the future, your perspective is said to be optimistic.  Is this a sustainable perspective?

Personal attitude is yours to control.  Optimism can be a fabulous way to approach each day, why not.  By it very nature optimism is positive and associated with good feelings.

Approaching each day feeling good is not a bad thing.  Consistent and persisent optimism is positive so why not adopt this a a permanent attitude.?

Trouble on the horizon

When hiking you run into a bear.  Your optimistic attitude leads you not to react, after all everything will work out.  Although an exaggerated example, there probably are cases where optimisum should be temporarily suspended.

Proactively worrying or predicting negative attitudes (pessimism) is probably not a good replacement for an optimistic attitude but realistically recognizing  the potential for bad results is probably not a bad thing.

Attitude Drives Outcomes

Whatever your underlying perspective, for example positive, negative, worried or optimistic; the way you behave is directly impacted.

If you are feeling good your eaction is typically more positive than if you are worried or fearful.  This is a good argument to strive for an optimistic viewpoint as your go to attitude.

Believe and Succeed

Athletes and sale people are well familiar that visualizing and believing in sucess to come can be a significant driver of results.  So don’t just be hopeful but believe it will be good.

You can get what you wish for.