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How do thousands of birds know how to come together in one place at one time? The portal to heaven is that this coming together is like those who know God and are flocking toward eternity in unison with one goal: to become like Christ and add to the migration by our flight.
...until we all reach unity in the faith and in the knowledge of the Son of God and become mature, attaining to the whole measure of the fullness of Christ.
Ephesians 4:13 NIV