You can see that the term “second coming” is a bit misleading, for he is not coming from some far away place. He is breaking through from behind the veil of hidden-ness. When he does, the already present, but ordinarily hidden, kingdom of God will be manifest to all and will overcome and replace all other kingdoms. So, what does it mean to pray, “your kingdom come, on earth as it is in heaven”? It means something like “Living God, even before the Day of the Lord, reveal what is invisible, manifest what is hidden.”