What does the Bible say about how God opens hearts?

According to Acts 16:14, God opens the hearts of those He has chosen to respond to the gospel. This divine intervention is necessary because, as Scripture teaches, we are spiritually dead in our sins and unable to come to God on our own. Lydia's conversion serves as a clear example of God's sovereign grace in action, where He individually opens her heart to understand and attend to the words spoken by Paul. Ultimately, salvation is a work of God's Spirit, highlighting the necessity of His divine action in the heart of a sinner.