If thou be’st Prospero,
Give us particulars of thy preservation;
How thou hast met us here, who three hours since
Were wreck’d upon this shore; where I have lost –
How sharp the point of this remembrance is! –
My dear son Ferdinand.
…Irreparable is the loss, and patience
Says it is past her cure.

– William Shakespeare

The Tempest, Act 5, Scene 1. Alonso wants to know how Prospero survived on the island and talks about the irreparable loss of his son Ferdinand. This is dramatic irony, as Ferdinand has survived, which the audience and Prospero already know.