Generations

The LORD indeed did something  enormous when, about five thousand years ago, He sought out Abram and told him to leave his homeland in Ur of the Chaldees, and travel over a thousand miles to a different land. As God changed Abram's name to Abraham ("father of a multitude"), and promised him that his seed would be as infinite in number as the stars (Gen. 15:5, Gen. 17:1-7), He was not just founding a family line, or a people, or even a nation, but also a called out assembly of people out of every nation of earth, looking down many generations and individuals, even to you and me. God had each one of us in His sight, and He provided the Gospel of Salvation for us, when He called Abram out of Ur:
"Just as Abraham believed God and it was accounted to him for righteousness. Therefore know that only those who are of faith are sons of Abraham. And the Scripture, foreseeing that God would justify the Gentiles by faith, preached the gospel to Abraham beforehand, saying, "In you all the nations shall be blessed." So then those who are of faith are blessed with believing Abraham."   Gal. 3:6-9
The LORD said to Abraham, "In you...", not "By you...". When the LORD looks at what we see as a single individual, He sees every future person, or generation, who is inside us, just as we were present and destined inside our preceding generations. This is the infinite power in the seed, and this is just one reason why each life is purposed and important.
By this same principle, what the LORD teaches each of us individually is not just for ourselves and our lifespan here on earth and our own eternity in heaven, but for all of our future generations as well. I am not just speaking of our natural generations of related descendants, but of our spiritual generations of faith. While Abraham eventually had several natural children, his infinite descendants are in the spiritual generations of faith that followed in the likeness of Abraham's faith. Jesus defined Abraham's descendants as those who do the works of Abraham, including believing the truth spoken by One sent from God, Himself (Jn. 8:36-40). This is a principle that the scripture from Galatians is teaching us.
(*Interesting to Note:Jesus' implication in the Jn. 8 verses that we might be able to garner is that He is the One who taught Abraham from God. The verse from Galatians quoted above agrees, saying that "The Scripture" foresaw us and preached the Gospel to Abraham! And Jesus is The Word of God (Jn. 1:1-2,14, Rev. 19:11-16).
The importance of Abraham as a physical and spiritual progenitor of God's called out assembly of people ("ekklesia"), both Jew and Gentile (Rom. 1:16-17), is found in God's statement:
"And the LORD said, "Shall I hide from Abraham what I am doing, since Abraham shall surely become a great and mighty nation, and all the nations of the earth shall be blessed in him? For I have known him in order that he may command his children and his household after him, that they keep the way of the LORD, to do righteousness and justice, that the LORD may bring to Abraham what He has spoken to him." Gen. 18:17-19, also Gen. 22:18
The reason the LORD knew Abraham, and sought a relationship with him was for our benefit. According to Galatians also, the LORD taught Abraham the Gospel for our benefit, those future generations.
When God spoke to Abraham, and revealed secret things to him, He did it with Abraham's descendants of faith in mind. The LORD was revealing these things to us in Abraham, therefore, before we were even born, for the purpose of our salvation. Such is the mind and heart of the Father towards us.
How did God reveal the Gospel to Abraham, that Abraham, in turn, passed to his future generations? He revealed it in the most powerful and intimate way possible, as the LORD took Abraham to Mount Moriah, and brought him to the point of the near sacrifice of his son of the promise, Isaac. At that same time, the LORD revealed the principle of the substitute sacrifice of atonement to Abraham, which would be supplied by God and not man, His only begotten Son, when He revealed the Ram of sacrifice (El) caught in the thicket instead (Gen. 22:13-14). The Son of God, Jesus, would be sacrificed in the flesh at that exact location as well, many generations later. The LORD taught Abraham the resurrection from the dead when Abraham declared that both he and his son, Isaac, would return from Mt. Moriah (Gen. 22:5), even though he had been commanded to sacrifice Isaac (Gen. 22:1-2).
The LORD even taught Abraham about the New Jerusalem, the city of God, prepared as a Bride adorned for her Husband, revealed in the Book of Revelation (Rev. 21:1-3):
"By faith Abraham believed when he was called to go out...for he waited for the city which has foundations, whose builder and maker is God...Therefore, from one man, and him as good as dead, were born as many as the stars of the sky in multitude - innumerable as the sand which is by the seashore."   Heb. 11:8-12, also see Gen. 22:17
Abraham was told and shown all of these things for our benefit, as a blessing to us.
Sometimes, our vision is limited to what we can see now, and we become caught up in this limitation all too easily. However, the LORD is not limited in that way at all. He declares the end from the beginning, and He created and sees all that exists in time, before time, and after time. The LORD spoke this to us when He said"
"For My thoughts are not your thoughts, nor are your ways My ways", says the LORD. "For as the heavens are higher than the earth, so are My ways higher than your ways, and My thoughts than your thoughts."   Isa. 55:8-9
Abraham learned these things in order to teach us, and we learn these things in order to teach countess future "others" who are in us by their faith).

Our Father foresees and speaks to the generations.