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The difficulties which I meet with in order to realize my existence are precisely what awaken and mobilize my activities, my capacities.

To show the world what long experience gains, requires not courage, though it calls for pains; but at life's outset to inform mankind is a bold effort of a valiant mind.

Human development thus far has been fueled and guided by the feeling that things could be, and are probably going to be, better.

Since the Renaissance, a concept called 'progress' has been baked into our society. Progress - founded on an accumulation of knowledge through experience (and in the case of science, through experiment). To build on the past rather than endlessly relive it. That's what separates us from the beasts.

Yearning for the seemingly impossible is the path to human progress.

Although our intellect always longs for clarity and certainty, our nature often finds uncertainty fascinating.

Human progress has always been driven by a sense of adventure and unconventional thinking.

Success in life is founded upon attention to the small things rather than to the large things; to the every day things nearest to us rather than to the things that are remote and uncommon.

I believe any success in life is made by going into an area with a blind, furious optimism.

Human progress is neither automatic nor inevitable... Every step toward the goal of justice requires sacrifice, suffering, and struggle; the tireless exertions and passionate concern of dedicated individuals.