If we want to have great obstacles removed from our life, if we want to instantly experience the dead and dying trees withering before us, first we have the requirement for each of us to have faith. Check, God has given each of us a measure of faith (presumably bigger than a mustard seed). Therefore, we are fully equipped for action; we have been given what is necessary. But the catch is that we must not doubt, or we must not let anything cause us to doubt, this is a work God must do in us.