Hence one should hold onto the dreams. Certain words are paired together or put in lines together to show emphasize on them.
Dreams are something that the poet probably synonymizes with hope. Like barren field which is frozen with snow a man without dreams is hindered from productive and motivational thoughts.
As a college student, I find this to be an important idea to keep in mind. Even if we lose our way or forget about our goals, we are still in control of them. Hughes brings attention to the consequences of one letting their dreams die.
He connects it with what your life will be like depending on what you have in mind for yourself. There are things that must be accomplished in life before you can truly find what your goals and dreams are. This is a pretty dramatic comparison considering there are a lot of other things people have in their life than just goals to pursue and achieve.
If you look at the actual way the poem is set up and written, it goes with this theme of moving forward no matter what.