Charles Spurgeon Commentary Genesis 22:17-18

"that in blessing I will bless thee, and in multiplying I will multiply thy seed as the stars of the heavens, and as the sand which is upon the seashore. 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." — Genesis 22:17-18 (ASV)

And in multiplying I will multiply your seed as the stars of the heaven, and as the sand which is upon the sea shore; and your seed shall possess the gate of his enemies; and in your seed shall all the nations of the earth be blessed; because you have obeyed my voice.

See the result of one man's grand act of obedience, and note how God can make that man to be the channel of blessing to all coming ages. Oh, that you and I might possess the Abrahamic faith which thus practically obeys the Lord, and brings a blessing to all the nations of the earth!