The testimony of every scientist is that the frontiers that are opening out ahead of us now are far wider and more spectacular than any frontier of America in the past. Our horizons are not closed. We are going to write a greater development in America than has ever been conceived.

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Quote text and notes from Wikiquote: Eric Johnston (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.