There is an interesting clause tucked away in Acts 16:14 have to do with Lydia's conversion: "...whose heart the Lord opened."
Sometimes through lives we have the pleasant experience of seeing a hard heart softened. Here is a miserly man of considerable wealth who never cares about anyone but himself and his money. He falls very ill and contemplates the way his life has been spent and then vows to himself and to the Lord that if his health should return, he will seek out and help those in need. His heart has been opened.
Picture a farmer, a simple, quiet man of brawny physique and calloused hands, a man used to hard living, as the nurse gently lays his newborn baby girl into those big hands. His heart melts.
The entire verse in Acts 16 says, "And a certain woman named Lydia, a seller of purple, of the city of Thyatira, which worshiped God, heard us; whose heart the Lord opened, that she attended unto the things which were spoken of Paul. And when she was baptized ..."
How did the Lord open Lydia's heart? The very same way He opens hearts today; with the teaching of His Word. The good news of forgiveness and security and genuine hope for heaven goes deeply into the souls of people who will listen. That is what is meant by the Hebrews writer who said, "For the word of God is quick, and powerful, and sharper than any two-edged sword, piercing even to the dividing asunder of soul and spirit, and of the joints and marrow, and a discerner of the thoughts and intents of the heart" (Hebrews 4:12).
Have you let the Lord open your heart to His wonderful truth and to the joy of serving Him?