Personal optimism is required for how we are to live our own lives. When we consider the great commandment this optimism can be extended to our neighbors. This optimism concerns the person’s potential to be influence by the spirit of the lord in some capacity because of His own self-proclaimed love for them.
This is does not mean that we are unwise concerning the negative disposition of some who may find our company. It is does mean that for us we are to not be moved by the negativity and follow the path that God has set for us to follow. This path is marked by serpentine optimism that creates opportunities for others do and learn the right thing.
By extending the optimism to others we are loving them as we love ourselves. The content of the optimism is of course customized to the person or situation.
The Christian with a sour face that lasts too long is not following God. At least not at that moment. The Christian with a sour face and overly negative disposition for their neighbors is not following God.
This optimism need not extend to positions on large complex interactions like national policy. Pessimism regarding the direction of the culture is different than the pessimism about the person in front of you.
On Miracles
I think the best way to approach miracles in our time is to say that they are occurrences that defy the reasonable expectations of understood technologies and/or seem to demand the experience of a sense of wonder. Miracles change how we understand the world. That which was once a miracle may not be a miracle once the new understanding becomes common knowledge. Television was miracle, but is now not. This is an example of a transitory miracle.
There are other miracles, such as birth, joy, agreement, love and the like which are well within out technological capabilities, yet still demand the experience of wonder. These could be termed common miracles.
Another type of miracle would be the uncommon miracle. The re-growth of a human hand would be considered an uncommon miracle. These are the claims of many biblical miracles (i.e. raising from the dead, parting the sea, etc.). They are miracles in that certainly defy technological expectations. They are uncommon in that they appear to be impossible due to the fact that they are not generally repeatable even if they are claimed to have happened. Also, even if they seem impossible they would have to have a physical basis to have occurred and thus would simply become a transitory miracle once there was more understanding of the technology. In either case healthy skepticism should avoid taking actions that depend on an uncommon miracle for success. Our skepticism however should always allow for the transitory miracle to be discovered by available technologies.