After these things God tested Abraham and said to him, “Abraham!” And he said, “Here I am.”  He said, “Take your son, your only son Isaac, whom you love, and go to the land of Moriah, and offer him there as a burnt offering on one of the mountains of which I shall tell you.”  So Abraham rose early in the morning, saddled his donkey, and took two of his young men with him, and his son Isaac. And he cut the wood for the burnt offering and arose and went to the place of which God had told him.  On the third day Abraham lifted up his eyes and saw the place from afar.  Then Abraham said to his young men, “Stay here with the donkey; I and the boy will go over there and worship and come again to you.”  And Abraham took the wood of the burnt offering and laid it on Isaac his son. And he took in his hand the fire and the knife. So they went both of them together.  And Isaac said to his father Abraham, “My father!” And he said, “Here I am, my son.” He said, “Behold, the fire and the wood, but where is the lamb for a burnt offering?”  Abraham said, “God will provide for himself the lamb for a burnt offering, my son.” So they went both of them together.
– Genesis 22:1-8
The Lord instructs Abraham to sacrifice his son, Isaac. Isaac was miraculously born to Abraham when he was 100 years old. He is very much the son whom Abraham loves. Yet Abraham obediently takes his son to Mount Moriah and prepares to sacrifice him there.
But why? Is Abraham just resigned to the fact that he has to obey God since He’s God? Abraham is aware that Isaac is a gift directly from the Lord. Perhaps, he reminds himself of Job’s words: “The Lord gave, and the Lord has taken away; blessed be the name of the Lord” (Job 1:21b).
I believe Abraham is not driven by resignation, but by hope. Prior to Isaac’s birth, the following exchange between Abraham and God took place in Genesis 17:18-19:
 And Abraham said to God, “Oh that Ishmael might live before you!”  God said, “No, but Sarah your wife shall bear you a son, and you shall call his name Isaac. I will establish my covenant with him as an everlasting covenant for his offspring after him.
Abraham remembers the promise of God. He knows that God can be trusted. Abraham does not know how God can establish a covenant with Isaac if he is dead. Abraham does not know how God can establish an everlasting covenant with Isaac’s offspring if Isaac passes away before he even has any offspring. But Abraham knows that God is not a liar and He will do what He says. Perhaps God will raise Isaac from the dead. Perhaps God will provide a sacrificial lamb. Ultimately, it doesn’t matter how God does it, but He is certain to fulfill every word.