George Leo Haydock

And a light is risen, &c. This light, foretold by the prophet Isaias, (chap. ix, ver. 1,) was our Saviour Christ, the light of the world, who now enlightened them by his instructions, and by his grace. (Witham) — Thus when the morning star has gone by and disappeared, the sun rises and diffuses its light to mortals, who rejoice that the darkness of night is removed from the earth. (Jansenius)