Last week was the 130th anniversary of the birth of Helen Keller
Every optimist moves along with progress and hastens it, while every pessimist would keep the worlds at a standstill. Pessimism kills the instinct that urges men to struggle against poverty, ignorance and crime, and dries up all the fountains of joy in the world.
Her autobiography is worth reading - and available as a free download
http://www.archive.org/details/storyofmylife005396mbp