Which set of lines from act 1 scene 5 of Shakespeare's Twelfth Night is a plea to Olivia to come out of mourning, get married, and have children?

"Lady, you are the cruel'st she alive,

If you will lead these graces to the grave,

And leave the world no copy."

These lines are Viola talking to Olivia (as Cesario) as a message from Orsino. The reference to leaving the world a copy is referring to having children, and this is saying that it would be a shame to mourn until she dies and not have any children.