Matthew 13:15-17

"Heart" has the word HEAR in it....so if I truly Love my Lord, I will hear Him with love and a desire to obey. My heart will not be dull , and I will understand what He wants of me. 
I would also LISTEN to those I love with carefulness and attention to everything about their words, seeing their heart as they speak. O Lord teach my ears and eyes sharpness, openness, and understanding. Verse 16 says my eyes are blessed and my ears do hear! But Lord, why do I often not see or listen to the voices of my loved ones with sharpness or understanding? It's because of my own sin which blinds my heart, and dulls my hearing. My ideas and thoughts get in the way of truly hearing. Purge me of my own thoughts, and give me clear eyes and ears that truly want to understand, obey You, and help those around me.

His Word is dependable and lays us open!

God means what he says. What he says goes. His powerful Word is sharp as a surgeon’s scalpel, cutting through everything, whether doubt or defense, laying us open to listen and obey. Nothing and no one is impervious to God’s Word. We can’t get away from it—no matter what. (Hebrews 4:12, 13 MSG)

Don't you want to know the reality of your own heart? I mean I know I'm a sinner, but sometimes I don't see exactly what that means! So, reading His Word will "lay us open" to see our hearts as HE sees them, and His rebuke is loving and so good, because of His Grace through Christ. Praise Him that we still have His Word to look into, and if we sincerely ask His Spirit to teach us and show us our hearts He is faithful to answer! And He gave us His Spirit to lead us into righteousness....may I not allow my heart to be hardened so that I become impervious to His Word. But if I stray, He is the Good Shepherd and will draw me back to Himself.