The correct answer is:
But at my back I always hear
Time's winged chariot hurrying near;
And yonder all before us lie
Deserts of vast eternity.
(Andrew Marvell, “To His Coy Mistress”)
These lines highlight the fleeting nature of life. The author argues that he can hear the "winged chariot" of time, meaning he can feel time passing, and "hurrying near." He knows that before us, there lies a desert of eternity. This is likely to refer to death. He believes that death is fast approaching, and that after death, lies an eternity.