Most of us reacted to the news with cautious/guarded 'optimism'. [=a feeling that something good may happen but will not definitely happen]
He maintains a sense of 'optimism', despite all that has happened.
The early sales reports are cause/reason/grounds for 'optimism'.
(..) Sit down over here. Okay, easy, easy. I'll just a... Try to relax. Your're going to be okay. Forced optimism in your voice suggests you are trying to listen a sensitive calm in order... Cut the whore shit. Doctor. I failed to see how excrement of any kind feels relevance in our current situation. (..)2016 Star Trek Beyond