The Vigil of St Andrew, Apostle
The Gospel tells us that St John the Baptist, whilst fulfilling his mission of preparing souls for the coming of our Lord, pointed out the Messias to his disciple Andrew.
Dóminus secus mare Galilaeae vidit duos fratres, Petrum et Andréam, et vocávit eos: Veníte post me: fáciam vos fíeri piscatóres hóminum. * Coeli enárrant glóriam Dei: et ópera mánuum ejus annúntiat firmaméntum.
The Lord walking by the Sea of Galilee, saw two brothers, Peter and Andrew; and He called them: Come ye after Me, I will make you to be fishers of men. * The heavens show forth the glory of God, and the firmament declareth the works of His hands.
(St Matthew 4:18 and Psalm 18:2 from the Introit of Mass)
Quaesumus, omnípotens Deus: ut beátus Andréas Apóstolus, cujus praevenímus festivitátem, tuum pro nobis implóret auxílium; ut, a nostris reátibus absolúti, a cunctis étiam perículis eruámur.
We beseech Thee, O almighty God, that the blessed apostle Andrew, to whose festival we look forward, may implore Thy help for us; that being absolved from our sins, we may likewise be delivered from all dangers.
Catholic Encyclopaedia on St Andrew: http://www.newadvent.org/cathen/01471a.htm