To be able to overcome any task, accomplish any mission, achieve self-defined success one must begin with belief. Without belief, one does not think it is possible to achieve what they are imagining in their minds. If you do not think something is possible, or that you are not capable of such a feat, well... you have already been defeated.
Having belief in oneself does not guarantee success, but without it it does guarantee you failure. Belief is the ground where the stairway to success begins, without it the stairs have no foundation and you cannot muster the energy for the journey.
Belief is not a binary trait that you do or don't have, it is a state that is constantly in flux and must be regularly nurtured. If you're searching for motivation today, instead cultivate self-belief and let the energy come from within you.
Believe in yourself today.