
“Don't ask for what you'll wish you hadn't got.”
postea noli rogare quod inpetrare nolueris.
Seneca himself states that he is quoting a 'common saying' here.
Alternate translation: Do not ask for what you will wish you had not got. (translator unknown).
Source: Epistulae Morales ad Lucilium (Moral Letters to Lucilius), Letter XCV: On the usefulness of basic principles, Line 1