i think maybe a useful tool for working is; whenever i start believing things are impossible, i am simply tired and need rest. i can begin again when i have the energy to believe in possibilities. i am not a negative person, i am just exhausted.
Optimistic really ought to be a verb
It's something you *do*, not some property you happen to possess. Sometimes it's easy to do, and sometimes it's darned hard, requiring imagination & determination
in times of intense stress or adversity, future-oriented thinking such as hope may be more effective than mindfulness in sustaining positive mindsets and action-oriented outcomes such as engagement.