We Have a More Sure Word of Prophecy

When Shall All Israel be Saved and When is the fulness of the Gentiles completed? They are both tied to the Second Coming of Christ but separated by the tribulation.
The history of prophecy as we look back on its fulfillment makes us more sure of what is to come. Heb 6:18, That by two immutable things, in which was impossible for God to lie, we might have a strong consolation, who have fled for refuge to lay hold upon the hope set before us: The Certainty and Power of his Word and the faithfulness of His Character.