Belief is not a matter of choice, but conviction. A conviction that moves us to do things we might not otherwise do. Important things. Hard things. Worthwhile things. This might seem irrational to some, but there are more ways to see than with our eyes, more ways to feel than with our hands, more ways to hear than with our ears.
Believe in something greater than yourself. It will change your life and the lives of those around you. Believe in miracles. Believe that there is someone at the door, knocking, waiting for you to be patient enough, committed enough, and caring enough to answer.