Why can't the lovers indulge in a prolonged courtship? ( MEG 101 ) ( ANDREW MARVELL )

The speaker suggests that the lovers cannot indulge in a prolonged courtship because of the inevitability of time and the fleeting nature of life. He hears the sound of "Time's winged chariot" hurrying near, and he sees "Deserts of Vast Eternity" before them, implying that their time together is limited and they must make the most of it. The speaker is aware that they will not be able to enjoy their love forever, and therefore, he urges his beloved to seize the moment and make the most of their time together.