In today's feast, the first reading is from chapter 10 of Paul's letter to the Romans. He speaks about how people can't believe unless someone is sent to preach to them. He says, "Faith comes from what is heard, and what is heard comes through the word of Christ."
This gives us two things to ponder. First, God speaks to our own hearts, sending in prayer the light we need to see his will and to do it. It's amazing how this often comes as a flash of insight, when God makes known something to us. It happens in an ordinary way but it comes through grace.
Second, we can help other people by offering a word of faith in appropriate ways. Maybe someone is gossiping or backbiting, and the Holy Spirit can inspire us with a good word to say that can perhaps turn the conversation in another more positive direction.
St. Andrew, pray for us that we might preach the Gospel like you did and bring others to faith in Jesus Christ.