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The desire to understand the world and the desire to reform it are the two great engines of progress, without which human society would stand still or retrogress.

Bertrand Russell
Two, Justice, Progress
"Marriage and Morals". Book by Bertrand Russell, Ch. 20, p. 301, en.wikiquote.org. Marriage and Morals.
The desire to understand the world and the desire to reform it are the two great engines of progress, without which human society would stand still or retrogress.