"Unless the Lord builds the house, those who build it labor in vain" (Psalm 127:1).
But your work is not in vain as you abound in the work of the Lord (1 Corinthians 15:58). Even if your work goes nearly anonymous in the long run, like that of St. Simon and St. Jude. Still, you are God's fellow worker (1 Corinthians 3) as Christ builds the House of His Church when the Spirit of your Father speaks through you (Matthew 10:20, responsory for Apostles and Evangelists).
(Dr. Stuckwisch has this sermon for the day.)