Second Nephi 2:4

And thou hast beheld in thy youth his glory; wherefore, thou art blessed even as they unto whom he shall minister in the flesh; for the Spirit is the same, yesterday, today, and forever. And the way is prepared from the fall of man, and salvation is free.

Jacob saw Christ six hundred years before He was born and was as blessed as though who walked with him in Judea. We can be as blessed after the fact as Jacob was before the fact. Salvation is the same yesterday, today, and forever.