Quotes from book
Optimism

Stuck in a rut? Need an attitude adjustment? This inspirational classic from American author Helen Keller is bound to fit the bill. Rendered deaf and blind by scarlet fever in her infancy in a time when the disabled were often shunned and ignored, Keller managed to learn to read, write, and speak, not in only in her native English, but in several other languages, as well. Keller regards optimism as "the faith that leads to achievement," and this treatise lays out her views on making the best of even the direst of circumstances.

Optimism (1903)
Context: The highest result of education is tolerance. Long ago men fought and died for their faith; but it took ages to teach them the other kind of courage, — the courage to recognize the faiths of their brethren and their rights of conscience. Tolerance is the first principle of community; it is the spirit which conserves the best that all men think.

“Optimism is the faith that leads to achievement; nothing can be done without hope.”
Optimism (1903)
Variant: Optimism is the faith that leads to achievement