“For my thoughts are not your thoughts, neither are your ways my ways,” declares the Lord. “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).”

God’s thoughts are higher than your thoughts. What he desires and plans are far bigger than what you desire and plan. Therefore, speaking of the fulfillment of God’s word, it will be difficult if you confine yourself to your own small and selfish desires and plans. Abram was childless, and wanted a child who would inherit his possessions. His wife, Sarai, wanted a baby that she could hold in her arms. But God’s plan for them was much bigger than that.

Leave your country, your people and your father's household and go to the land I will show you. I will make you into a great nation and I will bless you; I will make your name great, and you will be a blessing. …and all peoples on earth will be blessed through you (Gen 12:2-3).

And the land that God planned to give him was much larger—not a field or a small piece of land.

Lift up your eyes from where you are and look north and south, east and west. All the land that you see I will give to you and your offspring forever (13:14-15).

What about the purpose of all of this? Why did God desire to give him all of these? It was not simply about the increase of his offspring or the possession of the land. His thoughts were far deeper than Abram’s thoughts.

For I have chosen him, so that he will direct his children and his household after him to keep the way of the Lord by doing what is right and just, so that the Lord will bring about for Abraham what he has promised him (18:19).

For this purpose, God taught and trained him. He wanted Abram to have the same thoughts as his own. It was for this reason that God commanded him to sacrifice Isaac to him.

Take your son, your only son, Isaac, whom you love, and go to the region of Moriah. Sacrifice him there as a burnt offering on one of the mountains I will tell you about (22:2).

You should not consider the desires you have in your heart to be merely your own—small and selfish. God is not a tool with which you come to have what you want. No, he is the one who created you, and he always has something he himself wants to do for you and through you. You are his tool for the fulfillment of his word.

… so is my word that goes out from my mouth: It will not return to me empty, but will accomplish what I desire and achieve the purpose for which I sent it (Isa 55:11).

The fulfillment of God’s word is the fulfillment of what he desires. He speaks what he himself desires and fulfills what he himself speaks. We are his instruments, and we should let him fulfill his own word.

The Lord said to me, "You have seen correctly, for I am watching to see that my word is fulfilled (Jer 1:12)."

Now to him who is able to do immeasurably more than all we ask or imagine, according to his power that is at work within us, to him be glory in the church and in Christ Jesus throughout all generations, for ever and ever! Amen (Eph 3:20-21).