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trial and error

«That which causes us trials shall yield us triumph: and that which make our hearts ache shall fill us with gladness. The only true happiness is to learn, to advance, and to improve: which could not happen unless we had commence with error, ignorance, and imperfection. We must pass through the darkness, to reach the light.»
«Action and reaction, ebb and flow, trial and error, change - this is the rhythm of living. Out of our over-confidence, fear; out of our fear, clearer vision, fresh hope. And out of hope, progress.»
«The pursuit of peace and progress cannot end in a few years in either victory or defeat. The pursuit of peace and progress, with its trials and its errors, its successes and its setbacks, can never be relaxed and never abandoned.»
«The pause between the errors and trials of the day and the hopes of the night.»
«Most species do their own evolving, making it up as they go along, which is the way Nature intended. And this is all very natural and organic and in tune with mysterious cycles of the cosmos, which believes that there?s nothing like millions of years of really frustrating trial and error to give a species moral fiber and, in some cases, backbone.»