2. A Nation of Great Multitude
Throughout the Book of Genesis, God promises Abraham that his descendants will be of great multitude.
It is known that Isaac struggled to find a suitable wife. Isaac was 40 years old and unmarried, so Abraham who was now 140 years old, sent a servant out to find a wife for Isaac.
Eventually the dutiful servant found Rebecca, who went onto become Isaac's first and only wife.
It took Isaac another 20 years before he was able to make his wife, Rebecca pregnant. Eventually, Rebecca gave birth to twins: Esau and Jacob when Isaac was 60-years old and Rebecca was about 36.
This late start to marriage, family life, and offspring should be contrasted with other patriarchs of the Bible, who had no trouble finding women, getting married and conceiving children.
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
[GENESIS 22:17]
Now the Lord had said unto Abram, Get thee out of thy country, and from thy kindred, and from thy father's house, unto a land that I will shew thee: And
I will make of thee a great nation, and I will bless thee, and make thy name great; and thou shalt be a blessing:
[GENESIS 12:1-2]
But thou shalt go unto my country, and to my kindred, and take a wife unto my son Isaac.
[GENESIS 24:4]
And the servant took ten camels of the camels of his master, and departed; for all the goods of his master were in his hand: and he arose, and went to Mesopotamia, unto the city of Nahor
[GENESIS 24:10]
And the man bowed down his head, and worshipped the Lord.
[GENESIS 24:26]
And Isaac was forty years old when he took Rebekah to wife, the daughter of Bethuel the Syrian of Padanaram, the sister to Laban the Syrian
[GENESIS 25:20]
And after that came his brother out, and his hand took hold on Esau's heel; and his name was called Jacob: and Isaac was threescore years old when she bare them
[GENESIS 25:26]