This iconic quote is full of optimism and imagination just like Mr. Disney himself. Some might disparage these words, arguing that it leads one to believe that all dreams are possible. I would reply that those who dream are more likely to achieve their goals than those who do not.
Dreaming and doing can not live separately. Dreams are what inspire and propel one into the process of actualization. It is a rocket to the moon before the first steps on lunar soil. It is the hot air that fills a balloon before lifting it off the ground. It is the fragrant smell of coffee that draws one to drink a mugful.
Dreams can only be fulfilled by working hard. While dreaming is the inspiration, hard work is the less glamorous, nitty-gritty process that usually includes mistakes and failure. These only contribute to the journey of success. This middle ground of learning and discovery is actually where creativity and problem solving cultivate.
No, not every dream is possible, but it is more likely to come true if it is combined with hard work, discovery, learning, and patience. So start dreaming and start doing!