Jesus never minced words. He was always succinct and unambiguous in His communication. When He said, “I have come down from heaven,” He was speaking of His spiritual origin. This should further help you understand what He meant when He said, “…I am not of this world” (John 8:23). This shows that your origin has nothing to do with your physical birth; the land of your nativity.
Those to whom Jesus spoke probably knew where He grew up in Nazareth, His mother, His siblings, etc. The Bible actually records that, on a certain day, Jesus went out to preach in the town where He was raised as a little boy, but they didn’t believe His message. They said, “Is not this Jesus, the son of Joseph, whose father and mother we know? How is it then that He says, “I have come down from heaven”?” (John 6:42).
Their lack of understanding of spiritual realities made them not to believe in Him. The same thing happens today. Those who are spiritually unlearned don’t understand us when we make declarations on the basis of our divine origin. We’re not of this world. The Bible says in 1 John 4:4, “You are of God, little children…”; that means you hail from God; your origin is in Him.
It’s not how you were born, or where you were born, that determines your origin; otherwise, Jesus would have said “I came from Nazareth,” but He didn’t say that. He said, “I came down from heaven.” We’re not of the corruptible seed of man; we’re born of the Word (1 Peter 1:23), which makes us indestructible and eternally victorious. Glory to God!