The Lord has weird and unconventional ways of accomplishing the things He desires. Everything He wants to get done, eventually gets done in the time that God wants it done, but the methods He uses to execute His plans are difficult to understand from a human perspective. For example, the Abrahamic Covenant was an unconditional 3-fold promise that God made to Abraham, and that He swore (upon Himself because there was none greater) to keep that promise for all of eternity. God promised Abraham that He would be a great nation and have lots of descendants. God promised Abraham a great land inheritance. God also promised that Abraham's descendant would be a blessing to all of the families of the world (Messiah). Yet God did some interesting things to fulfill those promises.
When God made efforts to provide a son for Abraham, God waited until Abraham was 100 years old, then when Isaac was grown, God tested Abraham by commanding him to kill Isaac as a burnt offering. This is an unconventional way of making someone "a great nation." Normal human reasoning would likely lead one to think that Abraham would need to start having many kids at an early age, and the extent of his "greatness" as a nation would be determined by the size of his family as well as the strength. God proves through scripture that He doesn't think these ways, nor work these ways.
When God made the promise to give Abraham a great land inheritance, it is hard to tell if God was working to fulfill that promise. There is the testimony of Abraham receiving wells that he dug from Abimelech in Genesis chapter 21, but other than that, the scriptures are detailed to show that Abraham was living as a foreigner in the land of Canaan - the land that God promised. However, in Genesis 23:1-20, the Lord does work to put some of the Promised Land into the hands of Abraham as his possession, though in unusual ways. Genesis 23:1-20 documents the death of Sarah. The scriptures show that Sarah, the wife of Abraham, lived to be 127 years old. Though she felt it impossible to give birth at her age, she lived to see her son be 37 years old. When she died, Abraham desired to give her a proper burial. However, being a foreigner in the land of Canaan, he asked the leaders of the Hittites for permission to bury his wife.
The scripture show that Abraham had quite the reputation. The Bible explains that the Hittites were more than willing to allow Abraham to bury his wife because they knew about his relationship with God. The scriptures specifically say that the Hittites recognized that Abraham was God's chosen in the land. Though the scriptures are not so detailed to explain how the Hittites came to this conclusion, one can gather that there was something about the way that Abraham lived that allowed the Hittites to come to this conclusion. When one considers the history of the Hittite people, and recognizes their pagan and idolatrous ways, it is a powerful testament credited to Abraham that the Hittites recognized God in the ways that Abraham lived. It is true that Abraham was not perfect, had many lapses in faith, and made many repeated mistakes; but overall, the people around Abraham knew of Yahweh by the way that Abraham lived! Abraham's relationship with God was so noticeable that it actually caused the Hittite people to fear Abraham!
The scriptures go on to show that the Hittites volunteered to give Abraham any portion of land he wanted to bury Sarah in. Abraham requested a specific cave in Hebron that a man had already owned. The man agreed to allow Abraham to bury his wife in that cave, but in respect for Abraham and his relationship with God, the man also offered the whole plot of land that the cave was on, and offered it for free! Abraham insisted on paying, and after the two men went back and forth (the Hittite wanting to give the land away, and Abraham wanting to pay for it), the men agreed on Abraham paying the fair market price, and the land was sold to Abraham.
Though this testimony may seem like simple historical narrative of meaningless events, the scriptures reveal that God was working towards the fulfillment of His promises. God promised Abraham a land inheritance, and on that day, as documented in Genesis 23:1-20, Abraham received a major portion of that land. Abraham finally owned a piece of land in Hebron, which is about 10 miles south of Bethlehem. One must consider the manner in which God provided this land. God provided this land as burial ground for Abraham's wife. The scriptures will later show that this is the same place Abraham and his sons would be buried as well. When God promised Abraham a land inheritance, it is not likely that he imagined the inheritance coming to him in this way, under the context of death. Nevertheless, the death of Sarah was the vehicle that God decided to use to give Abraham part of the land. God was glorified in this manner of work because the Hittite people recognized the relationship that God had with Abraham, and the platform was provided for the Hittites to express that sentiment and fear of God.
The truth of the matter is, God is faithful to His promises. However, if one is not paying attention, it can be difficult to recognize this truth since God does not work in ways that are traditional, conventional and normal to human reason. God's ways are not our ways, and His thoughts are not like ours. This truth was ultimately demonstrated in that God transformed Himself into a man for the purpose of death in order to offer eternal life. Therefore, as heirs to God's promises, one should not expect God to do things in ways that we would see fit or "rational." Instead, one should humble one's self and simply trust that God will fulfill His promises any way He chooses, and that fulfillment will likely come in a way that is unexpected, yet emphatically points to God for His glory. One should seek to align one's expectations with the truth that scripture reveals about how God works and simply know that God, somehow and someway only known to Him, God will faithfully do as His Word says.