Summary: What will it take to make you happy? You may be thinking that you need God to meet a material or money need that you have. You may want God to restore a broken relationship. You may have a physical weakness or disease that you would like to see God cure.
Abraham was learning to look at God instead of just his circumstances. Romans 4:19--21 Without becoming weak in faith he contemplated his own body, now as good as dead since he was about a hundred years old, and the deadness of Sarah's womb; yet, with respect to the promise of God, he did not waver in unbelief but grew strong in faith, giving glory to God, and being fully assured that what God had promised, He was able also to perform. (NAU)
Hebrews 11:11 By faith even Sarah herself received ability to conceive, even beyond the proper time of life, since she considered Him faithful who had promised. (NAU)
God's future promise should make us happy in the present.
[Vs.7-8] Paul makes a strong argument from these verses that Christ is the ultimate fulfillment of this promise to Abraham. Galatians 3:16--18 Now the promises were spoken to Abraham and to his seed. He does not say, "And to seeds," as referring to many, but rather to one, "And to your seed," that is, Christ. What I am saying is this: the Law, which came four hundred and thirty years later, does not invalidate a covenant previously ratified by God, so as to nullify the promise. For if the inheritance is based on law, it is no longer based on a promise; but God has granted it to Abraham by means of a promise. (NAU)
So the most important "impossible" thing that God promised was the coming of a Jewish Messiah who would save both Jews and Gentiles. Galatians 3:29 And if you belong to Christ, then you are Abraham's descendants, heirs according to promise. (NAU)
Gen.28:1-8 B. El Shaddai blesses the obedient
[V.1-4] Many years later the long promised son of Abraham, Isaac, passes on the same confidence that Abraham had to his son Jacob.
Are we passing on a joyful confidence in God to those around us?
[Vs.5-8] In this context Isaac in reminding his son that El Shaddai loves holiness. Followers of God must be careful to not make alliances with those who don't love God.
1 Peter 1:15--16 but like the Holy One who called you, be holy yourselves also in all your behavior; because it is written, "YOU SHALL BE HOLY, FOR I AM HOLY." (NAU)
Gen.35:1-4; 9-12 C. El Shaddai doesn't share worship
[Vs.1-4] God is about to change Jacob's name, but before He does God demands that every worldly god be abolished.
[Vs.9-12] The name Jacob means "supplanter." We might think of it today as meaning a "con artist." God is about to change his name to Israel.
"ISRAEL [IS ray ell] (prince with God).... The name Israel has been interpreted by different scholars as "prince with God," "he strives with God," "let God rule," or "God strives." The name was later applied to the descendants of Jacob, or the HEBREW people. The twelve tribes were called "Israelites," "children of Israel," and "house of Israel," identifying them clearly as the descendants of Israel through his sons and grandsons." 
Paul made this truth very clear in 2 Corinthians 6:16--18 Or what agreement has the temple of God with idols? For we are the temple of the living God; just as God said, "I WILL DWELL IN THEM AND WALK AMONG THEM; AND I WILL BE THEIR GOD, AND THEY SHALL BE MY PEOPLE. Therefore, COME OUT FROM THEIR MIDST AND BE SEPARATE," says the Lord. "AND DO NOT TOUCH WHAT IS UNCLEAN; and I will welcome you. And I will be a father to you, and you shall be sons and daughters to Me," Says the Lord Almighty. (NAU)