Galatians 4:4, But when the fullness of time had come, God sent forth His Son, born of a woman, born under the law.
Jesus did not advent as a baby until the time was right. He did not allow Himself to be killed until the time was right. And three days was the right time for Him to rise from the dead. Let us always pray, “Come, Lord Jesus,” but know He will come when the time is right. Many make predictions that He will come on a certain day, but He has made it irrevocably clear no one knows the day or hour save God the Father alone (Matthew 24:36).
We can never know, but it is enough to know He is coming again when the time is right. He could come this afternoon, tomorrow morning, next week, a hundred years from now, whenever. Just as Christ was born of a virgin when the time was right, so He shall come again when the time is right.
The Lutheran Column 