Virgil, Aeneid VI.261

Melphi

Melphi speaks

nunc animis opus, Aenea, nunc pectore firmo.

The priest translates

«Now you need courage, Aeneas, now a steady heart.»

And interprets

The moment is now. This line does not ask you to prepare a little more, to gather more information, to wait for a better sign: it tells you that the time for preparing is over. If you face an interview, a hard conversation with your family, a medical visit you keep postponing, a choice in love that makes you tremble, now you need courage. And you need a steady heart, that is, a constant one: not a burst of daring that fades within an hour, but a decision that holds even when fear comes. Fear will come; that is normal. This is not the time to turn back: it is the time to go in.

The historical translations

Annibal Caro (1581)
E la tua spada impugna. Or d’uopo, Enea,
Fa d’animo e di cor costante e fermo.
Theodore C. Williams (1910)
Now, all thy courage! now, th' unshaken soul!”

Source

Publius Vergilius Maro, Aeneis, ed. J. B. Greenough (1900) Virgil, Aeneid VI.261