Jesus makes it pretty clear that because of our unbelief we will not see miracles in our life (see below).
However, psychological experts warn against the dangers of unrealistic expectations.
See Psychology Today: The Danger Of Having Unrealistic Expectations
In summary, unrealistic expectations can lead to very negative consequences, if the outcome is not met.
However, the New Testament instructs us to believe - in the super natural, in the impossible or in psychology terms: the unrealistic.
Jesus Gives Life to a Dead Girl:
Matthew: 35 While Jesus was still there speaking, some men came from the house of Jairus, the synagogue leader. They said, “Your daughter is dead. There is no need to bother the Teacher.”
36 But Jesus did not care what the men said. He said to the synagogue leader, “Don’t be afraid; just believe.”
And so he did only a few miracles there because of their unbelief.
Should our life be filled by consistently believing in the impossible - will that end up damaging our faith or just create a denial fantasy world apart from reality?
Should we be thinking about unrealistic vs. realistic belief?
Since Jesus is no longer here in human form, is OK to have unbelief?
Are there any good studies or articles on this concept?