In the book Of Mice And Men, Lennie and George have a dream. Their dream is to have their own piece of land. They would have their own pigs, chickens, bunnies, and cows. Some might not think their dream is realistic, but i do. I think this because a lot of people want to have their own things and to be their own boss. What they want is to be farmers which people in our time period are. They work for themselves and its what they love to do.
It is very important for people to have dreams for the future because its something that you one day see yourself achieving. For example, my dream is to be a pediatrician. I have always wanted to take care of kids so I choose that for my future occupation. Some dreams lead to reality. When others doubt these dreams they are doubting their ability to make these dreams come true. They start to question things and make different decisions about their goals. This changes their life path.
If dreams go unfulfilled for a long period of time they become hard to achieve, obstacles are added, or the dreams are forgotten. For example, in the story Curley's wife wanted to be an actress. Her mother kept her from pursuing her dreams so she married Curley. Her mother was her obstacle. Due to this obstacle she choose to change her path of life which did not go with her dream.
Sometimes it might be better to hold onto an unrealizable dream rather than face reality. It is better to have these dreams during the bad times. It might prove to you that even though times are bad you still have things to look forward to. An example of this is, that even though George killed Lennie he can still accomplish his dream. He can get his own land or start a family if he wants. He should just know that he shouldn't let the bad times keep him from the good times.