Consider and act with reference to the true ends of existence. This world is but the vestibule of an immortal life. Every action of our lives touches on some chord that will vibrate in eternity.

Edwin Hubbell Chapin (1814-1880) American clergyman

(Attributed)
    (Source)

Quoted in Charles Northend, Memory Gems (1890).

Variant: "Every action of your life touches on some chord that will vibrate in eternity." ["Advice to the Young," quoted in Charles W. Sanders, Sanders' Union Fourth Reader (1873)]