A prickly translation…

Trying to figure out a decent (or at least poetically satisfying) translation of the text on the banner that appears in “The Knight’s Dream,” a painting by Antonio de Pereda (see here and on the LN Info & Submissions page). The text itself is: “Aeterne pungit, cito volat et occidit.” But the translation is a bit…prickly.

The Knight's Dream by Antonio de Pereda 1655