I have talked in the past about not getting caught up in blinding optimism. We have to look at the negative, the down side, the possibility of failure in order to see how to avoid it. We cannot walk through the woods at night without going slow and watching for low hanging branches. A low hanging branch is a good way to knock ourselves out.
However there is a basic optimism we must all have. Without it there is no hope and no reason to try. This optimism can be boiled down to one sentence. If we are alive and willing to work things can and will get better.
We cannot blindly hope that our lives will change if we keep doing the same thing over and over again. We have to work, we have to strive and we have to put out effort to change our lives. If we are willing to do that we can make things better, we can make a difference, we can change the world.