Looking at Abraham and Isaac with a simple faith.
God promised Abraham that Isaac would have children.
Genesis 21:12 And God said unto Abraham, Let it not be grievous in thy sight because of the lad, and because of thy bondwoman; in all that Sarah hath said unto thee, hearken unto her voice; for in Isaac shall thy seed be called.
God tells Abraham to offer Isaac as a sacrifice, in effect, to kill Isaac.
Genesis 22:2 And he said, Take now thy son, thine only son Isaac, whom thou lovest, and get thee into the land of Moriah; and offer him there for a burnt offering upon one of the mountains which I will tell thee of.
Abraham tells his servants that he and Isaac will return. He knew that, even though he planned on obeying God, that God would keep his promise (see 21:12 above).
Genesis 22:5 And Abraham said unto his young men, Abide ye here with the ass; and I and the lad will go yonder and worship, and come again to you.
Abraham fully planned on obeying God, trusting God, obeying god.
Genesis 22:10 And Abraham stretched forth his hand, and took the knife to slay his son.
God redeems his promise.
Genesis 22:11-12 And the angel of the LORD called unto him out of heaven, and said, Abraham, Abraham: and he said, Here am I. And he said, Lay not thine hand upon the lad, neither do thou any thing unto him: for now I know that thou fearest God, seeing thou hast not withheld thy son, thine only son from me.
Genesis 22:16-18 And said, By myself have I sworn, saith the LORD, for because thou hast done this thing, and hast not withheld thy son, thine only son: That in blessing I will bless thee, and in multiplying I will multiply thy seed as the stars of the heaven, and as the sand which is upon the sea shore; and thy seed shall possess the gate of his enemies; And in thy seed shall all the nations of the earth be blessed; because thou hast obeyed my voice.
Abraham returns to his servants, with Isaac, just as he knew he would.
Genesis 22:19 So Abraham returned unto his young men, and they rose up and went together to Beersheba; and Abraham dwelt at Beersheba.
God is more interested in our obedience than in our intentions and he rewards the faithful.