We have three approaches at ...

We have three approaches at our disposal: the observation of nature, reflection, and experimentation. Observation serves to assemble the data, reflection to synthesise them and experimentation to test the results of the synthesis. The observation of nature must be assiduous, just as reflection must be profound, and experimentation accurate. These three approaches are rarely found together, which explains why creative geniuses are so rare.
We have three approaches at our disposal: the observation of nature, reflection, and experimentation. Observation serves to assemble the data, reflection to synthesise them and experimentation to test the results of the synthesis. The observation of nature must be assiduous, just as reflection must be profound, and experimentation accurate. These three approaches are rarely found together, which explains why creative geniuses are so rare.
 John Dewey

Quotes from the same author

Arriving at one point is the starting point to another.
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 John Dewey
The self is not something ready-made, but something in continuous formation through choice of action.
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 John Dewey
Conflict is the gadfly of thought. It stirs us to observation and memory. It instigates to invention. It shocks us out of sheeplike passivity, and sets us at noting and contriving.
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 John Dewey
Without some goals and some efforts to reach it, no man can live.
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 John Dewey
Every great advance in science has issued from a new audacity of the imagination.
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 John Dewey