Suniemi (G4920) literally means to 'bring together' โ to synthesize disparate pieces of information into coherent understanding. It is the word for spiritual understanding, the kind that grasps the significance of what one hears or sees. Jesus consistently asks whether His disciples truly suniete โ do they really understand?
Matthew 13 (the Parable of the Sower) uses suniemi as the key variable: the seed on good soil is the person who 'hears the word and understands [sunieis] it.' Isaiah 6:9 is quoted about those who hear but do not understand [suniosi] โ the tragedy of religious exposure without spiritual perception. Understanding is not merely intellectual but a work of the Holy Spirit opening the heart.