The natural man receiveth not the things of the Spirit of God: for they are foolishness unto him: neither can he know them, because they are spiritually discerned. – 1 Corinthians 2:14 (KJV)

You stiff-necked people! Your hearts and ears are still uncircumcised. You are just like your ancestors: You always resist the Holy Spirit!  –Acts 7:51 (NIV)

A certain woman named Lydia, a seller of purple, of the city of Thyatira, which worshipped God, heard us: whose heart the Lord opened. –Acts 16:14 (KJV)

Did not our heart burn within us, while he talked with us by the way, and while he opened to us the Scriptures?…Then opened he their understanding, that they might understand the Scriptures.   –Luke 24:32, 45 (KJV)