Come one, come all! this rock shall fly
From its firm base as soon as I.

The speaker issues a bold, public challenge—“Come one, come all!”—and then anchors that bravado in an image of immovability: a rock will sooner lift from its base than the speaker will yield. The couplet is a compact declaration of steadfastness under pressure, suggesting defiance in the face of threats, rivals, or temptation. Scott frequently uses such stony, landscape-based imagery to convey moral or martial firmness, tying personal resolve to the permanence of the natural world. The effect is both theatrical (a rallying cry) and proverbial (a vow of unshakable constancy).