Searching for Helen Keller quotes found the following:
"When we do the best that we can, we never know what miracle is wrought in our life, or in the life of another."
"While they were saying among themselves it cannot be done, it was done."
"Alone we can do so little; together we can do so much."
"Walking with a friend in the dark is better than walking alone in the light."
"Optimism is the faith that leads to achievement."
"Keep your face to the sunshine and you cannot see a shadow."
"Although the world is full of suffering, it is also full of the overcoming of it."
"Science may have found a cure for most evils, but it has found no remedy for the worst of them all - the apathy of human beings."
"When one door of happiness closes, another opens: but often we look so long at the closed door that we do not see the one which has opened for us."
Do you have more quotes from Helen Keller? e-mail them in to me at firstname.lastname@example.org and I'll add them to the listing. Thanks.