St. Matthias was elected to fill the place of Judas. The saint was above all remarkable for his mortification of the flesh.
He sanctified him in his faith and meekness, and chose him out of all flesh. And He gave him commandments before His Face, and a law of life and instruction, and He exalted him. — Epistle, Book of Wisdom
The Imitation of Christ
Be fond of inquiring, and listen in silence to the words of the saints; and let not the parables of the ancients be displeasing to thee, for they are not uttered without cause.
After the fall of Judas from his place, another man was to be chosen to fill up the number, and the lot fell upon Matthias. That looks like chance, does it not? To the eyes of men, it was, but really it was God's will.
If you have ever been told or have reason yourself to believe that you have a vocation to a higher life, do not throw away to the world the most precious of your endowments, youth and virtue; let your offering to God be entire. Say an extra prayer each day for the grace to know what God has intended for your lifework; begin today.
You have not chosen Me, but I have chosen you.