The Old Testament tells us that He will come. The Four Gospels tell us that He has come. From the book of Acts through the book of Revelation we read that He will come again.
The first time Jesus came unnoticed into the world, the second time “every eye will see Him.”
In His first coming Jesus humbled Himself, being born in a stable in Bethlehem. When He returns, He will come back as King of Kings and Lord of Lords.