"Blessed are they that do his commandments, that they may have the right to the tree of life, and may enter in through the gates into the city."  

Revelation 22:14    

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From Patriarchs and Prophets:

 

"Since the sin of our first parents there has been no direct communication between God and man.  The Father has given the world into the hands of Christ, that through His mediatorial work He may redeem man and vindicate the authority and holiness of the law of God.  All the communion between heaven and the fallen race has been through Christ.  It was the Son of God that gave to our first parents the promise of redemption. It was He who revealed Himself to the patriarchs.  Adam, Noah, Abraham, Isaac, Jacob, and Moses understood the gospel.  They looked for salvation through man's Substitute and Surety.  These holy men of old held communion with the Saviour who was to come to our world in human flesh; and some of them talked with Christ and heavenly angels face to face."  PP 366.1