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The universal line of distinction between the strong and the weak is that one persists; the other hesitates, falters, trifles, and at last collapses or "caves in.

Edwin Percy Whipple (1866). “Character and Characteristic Men”, p.14
The universal line of distinction between the strong and the weak is that one persists; the other hesitates, falters, trifles, and at last collapses or caves in.