As Jesus passed on from there, he saw a man called Matthew sitting at the tax booth, and he said to him, “Follow me.” And he rose and followed him.
J.C. Ryle comments on Matthew 9:9
He can take a tax collector, and make him an apostle. He can change any heart, and make all things new. Let us never despair of any one’s salvation. Let us pray on, and speak on, and work on to do good to souls, even to the souls of the worst. “The voice of the Lord is powerful.” (Psalm. 29:4.) When He says by the power of the Spirit, “follow me,” He can make the hardest and most sinful obey.