The Greek noun dianoēma (διανόημα) refers to a thought, a mental conception, or the content of one's mind/understanding. It comes from dianoia (H1271, mind/understanding) and captures what the mind is actually thinking. It appears in Luke 11:17, where Jesus 'knowing their thoughts (dianoēma)' responds to the Pharisees' accusation that He casts out demons by Beelzebul.
Jesus' ability to perceive dianoēma — the actual thoughts of His opponents — is a mark of His divinity. Only God knows the thoughts of the heart (Psalm 139:2; Jeremiah 17:10). In Luke 11, Jesus doesn't wait for their accusation to be verbalized; He responds to what they are thinking. This connects to Hebrews 4:12: 'The word of God is living and active... discerning the thoughts and intentions of the heart.' The gospel deals not just with behavior but with dianoēma — the inner world of thought. Transformation requires the renewal of the mind (Romans 12:2), not just external compliance.