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  5. Mans moral nature is a riddle which only eternity can solve.

Man's moral nature is a riddle which only eternity can solve.

Henry David Thoreau
Men, Morality, Eternity
Henry David Thoreau (2013). “Delphi Complete Works of Henry David Thoreau (Illustrated)”, p.2126, Delphi Classics
Man's moral nature is a riddle which only eternity can solve.