virtue:

     Had we but world enough and time, 
     This coyness, lady, were no crime
     We would sit down and think which way 
     To walk, and pass our long love’s day. . . .
     An hundred years should go to praise 
     Thine eyes, and on thy forehead gaze; 
     Two hundred to adore each breast, 
     But thirty thousand to the rest;
     An age at least to every part,
     And the last age should show your heart, 
     For lady, you deserve this state,
     Nor would I love at lower rate.

     Marvell merged the rates of exchange with the rates of