What does Revelation 19:12 mean?
Jesus' first coming to earth was humble (Luke 2:7) and included His sacrificial death (Philippians 2:8). His second coming, however, sees Jesus arrive as the King of kings and Lord of lords, with piercing eyes. He sees all, and therefore is justified in making war. When John first received his vision of Jesus at Patmos, he reported that Jesus' eyes were "like a flame of fire" (Revelation 1:14).The diadems on Jesus' head show that He is the absolute ruler of the universe. In this capacity He is able to carry out the sentence of doom and destruction that He imposes on the wicked. Further, He is well qualified to take control of the nations and rule them. Psalm 2:8–9 God declares: "Ask of me, and I will make the nations your heritage, and the ends of the earth your possession. You shall break them with a rod of iron and dash them in pieces like a potter's vessel."
Among the many names He can claim, Jesus has a name only He knows. This likely refers to the fact that Jesus is indescribable. In ancient times, it was often held that knowing a person's name provided certain spiritual leverage (Genesis 32:27; Mark 5:9). Symbolically, then, the Son of God returns to earth with a name unknowable to any other person. His personality and deeds extend far beyond what we can comprehend.