All progress is precarious, and the solution of one problem brings us face to face with another problem.
Martin Luther King Jr.
The best road to progress is freedom's road.
John F. Kennedy
All progress means war with society.
George Bernard Shaw
The desire to understand the world and the desire to reform it are the two great engines of progress.
Bertrand Russell
All progress is based upon a universal innate desire on the part of every organism to live beyond its income.
Samuel Butler
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