Dreams are like muscles. If you don't exercise them and make them grow, they will wither and waste away.
Nothing of significance comes without effort, but the rewards far outweigh the contribution required. Dream how you can best use your life in service to God, then take steps to make your dream come true. There is no greater reward than what He has promised you.
For you have need of endurance, so that when you have done the will of God you may receive what is promised.