Doubt is the opposite of
trust.  It comes from placing your focus
on perceptions which validate belief systems in opposition to that
which you hope to achieve.  What if you
were to place your focus only on the prize? 
What if you did not allow doubt to enter the picture?  Then, my friend, you would create
miracles.  The mind will want to
protest.  It will look at things and
situations around you and do its best to point out “reality.”  This is when you must ask yourself, “What is
reality?”  The more you co-create your
reality with Spirit, the more you realize there is a far greater Reality than
the one which you temporarily inhabit now. 
See beyond that smaller reality. 
Have no doubt in your mind that the Reality you envision is already yours
in spite of lesser appearances, and it is guaranteed to show up.  Do you recall something about the faith of a
mustard seed?