I’d like to point out that you have only talked about hope without personal action to support a statement about hope as a whole. A better term for that would be wishful thinking. While I agree that not acting while hoping for change is foolish, I believe acting on hope can drive a person to perform beyond what would normally be achievable.
If the world is truly hopeless, then why would anybody put any effort into saving it? It seems to me that at least some level of hope for a better world or life would be a prerequisite toward making that world or life a reality.
Caffeine has a metabolic half life of 6-12 hours. This means that after a 24 hour period, there could be 1/4 of the original caffeine amount you drank in your system. If you drink the same amount of caffeine again at that point, now after a 24 hour period you ‘ll have up to 1/4 of that 1.25 amount in your system. If you consume caffeine daily, this can lead to an accumulation of caffeine that your body adjusts to always being there, becoming the new baseline normal. This would feel fine until you stop, at which point the caffeine your body expects to be there is gone, and it needs to take time readjusting to that absence. That leads to withdrawal symptoms.