“Walking with a friend in the dark is better than walking alone in the light.”
This line said by Helen Keller emphasizes the importance of having a friend by your side. Although it is preferred to walk in the light, solitude and being alone makes this seem undesireable. While on the otherhand, those who walk in the dark with a friend will enjoy much more. Having a friend by your side provides your own security and happiness. Think about all the times you needed a friend to get you through a tough situation. Late night calls crying because of a boy, or stress of making a decision. A friend is always there to help you make a decision and get you through any tought times. I honestly would not be able to survive without my close friends. They are the ones that pull me out of hardship and put a smile on my face even when it’s hard to be happy. A friend can always make you feel good and that is why having a friend by your side beats all other options. =)
Across the Universe 
I agree friends are always there to listen to what you have to say and are there for you when you are having a hard time. They are the best people to talk to when you have problems because they never judge you.
I do not mean to sound like a stubborn, dumb teenager but how did Helen Keller communicate with others? Anyway back to your quote, yeah I believe that with your friends anything is possible.