@Caroline,
That's a good point there. A daily monotonous grind can lead one to believe he has a clear picture of what his future will be like for the next
x number of years. If he believes it to be more of what his daily routine already presently is, he, in thought, has already experienced his future. In doing this, this unhappy man restricted himself to a linear future timeline instead of opening the totality of possible experience to himself.
A problem with this interpretation is that when Kierkegaard writes, "and
this experience he now remembers, instead of hoping for
it," '
it' looks to be referring to a specific determinate experience rather than to the indeterminate future.