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Wouldst thou wisely, and with pleasure, Pass the days of life's short measure, From the slow one counsel take, But a tool of him ne'er make; Ne'er as friend the swift one know, Nor the constant one as foe.

Friedrich Schiller (2013). “Delphi Complete Works of Friedrich Schiller (Illustrated)”, p.298, Delphi Classics
Wouldst thou wisely, and with pleasure, Pass the days of life's short measure, From the slow one counsel take, But a tool of him ne'er make; Ne'er as friend the swift one know, Nor the constant one as foe.