Our calling is to bear witness to the gospel and leave the heart’s receptivity to the Lord. We can’t “open the heart” of the hearer, but we can open our own mouths to speak the gospel message. Paul’s faithfulness to sow the seed of the gospel everywhere he went and leave the heart condition of the soil up to God was what resulted in churches being planted all over the Roman world. I wonder how many “Lydias” are apparently going about their business, yet desperately looking for God? Are we willing to be like Paul and spread the Word?