Isaac was the counterpart of his father in body and soul. He resembled him in every particular--"in beauty, wisdom, strength, wealth, and noble deeds." It was, therefore, as great an honor for Isaac to be called the son of his father as for Abraham to be called the father of his son, and though Abraham was the progenitor of thirty nations, he is always designated as the father of Isaac.
Despite his many excellent qualities, Isaac married late in life. God permitted him to meet the wife suitable to him only after he had successfully disproved the mocking charges of Ishmael, who was in the habit of taunting him with having been circumcised at the early age of eight days, while Ishmael had submitted himself voluntarily to the operation when be was thirteen years old. For this reason God demanded Isaac as a sacrifice when he had attained to full manhood, at the age of thirty-seven, and Isaac was ready to give up his life. Ishmael's jibes were thus robbed of their sting, and Isaac was permitted to marry. But another delay occurred before his marriage could take place. Directly after the sacrifice on Mount Moriah, his mother died, and he mourned her for three years. Finally he married Rebekah, who was then a maiden of fourteen.