Our quickened apprehension of continuing change, our broader and fuller vision of the history of life, disabuse our minds of many limitations set to the imaginations of our predecessors. Much that they saw as fixed and determinate, we see as transitory and controllable. They saw life fixed in its species and subjected to irrevocable laws. We see life struggling insecurely but with a gathering successfulness for freedom and power against restriction and death. We see life coming at last to our tragic and hopeful human level. Unprecedented possibilities, mighty problems, we realize, confront mankind to-day. They frame our existences.
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