My friend, there will come one day to you a Messenger, whom you cannot treat with contempt. He will say, “Come with me;” and all your pleas of business cares and earthly loves will be of no avail. When his cold hand touches yours, the key of the counting-room will drop forever, and he will lead you away from all your investments, your speculations, your bank-notes and real estate, and with him you will pass into eternity, up to the bar of God. You will not be too busy to die.

Abbott Eliot "A. E." Kittredge (1834-1912) American clergyman and Presbyterian leader

(Attributed)
    (Source)

In Josiah Hotchkiss Gilbert (ed.), Burning Words of Brilliant Writers (1883). I could not find any primary source that Gilbert borrowed from.